A drive mechanism for a heating furnace

Abstract

The utility model discloses a transmission mechanism of heating furnace, including furnace body and a plurality of transmission roll and set up in the transmission mechanism of one side of furnace body, transmission mechanism includes a plurality of bearing seat, a plurality of first driven sprocket, two secondary driven sprocket, two tertiary driven sprocket, transmission chain, driving sprocket, first drive unit and sprocket tensioning subassembly, and transmission roll is rotatably connected with bearing seat through connecting shaft, and first drive unit sets up on sprocket tensioning subassembly, and driving sprocket sets up on the output of first drive unit, and transmission chain is installed on driving sprocket and two secondary driven sprocket, and the outside of transmission chain is in contact with tertiary driven sprocket, and secondary driven sprocket and tertiary driven sprocket are all used for cooperation driving sprocket, and support transmission chain's rotation, and first drive unit is used for driving transmission chain's rotation through driving sprocket, and then drives transmission roll's rotation, and sprocket tensioning subassembly is used for adjusting the engagement degree of driving sprocket and transmission sprocket.

Description

Technical Field

[0001] This utility model relates to the technical field of heating furnaces, and in particular to a transmission mechanism for a heating furnace. Background Technology

[0002] Hot stamping, a key technology in modern manufacturing, has become an indispensable forming process in the automotive, aerospace, and home appliance industries due to its unique advantage of enhancing material plasticity at high temperatures. This technology uses specialized molds to precisely stamp heated sheet metal, resulting in parts with high strength, complex shapes, and precise dimensions. Particularly in the automotive industry, the application of hot stamping plays a crucial role in improving vehicle lightweighting and safety performance.

[0003] With the rapid development of the new energy vehicle market, the demand for lightweight materials has increased dramatically. Hot stamping products, with their high strength and lightweight characteristics, are gradually becoming key materials in the manufacturing of new energy vehicles.

[0004] Traditional heating furnaces have an effective internal width of 2.3 meters or 2.5 meters, primarily designed for heat processing of traditional sheet metal or single-door ring sheet metal. However, this is insufficient for production with double-door rings or single-door rings with transverse discharge (the furnace's width cannot accommodate the transport of such equipment). Due to market demand, the effective width of these furnaces can be optimized to 3.4 to 3.6 meters (the specific effective width will be set according to actual needs and can be further optimized later), thus meeting the requirements for double-door rings or single-door rings with transverse discharge. Smooth and damage-free transport is desirable; however, widening the effective width means the length of the relevant drive rollers needs to be changed accordingly. Furthermore, the drive mechanism adapted to the aforementioned heating furnace may not be suitable for the optimized furnace design, potentially leading to component overload and malfunction, as well as poor transmission efficiency. Secondly, in some heating furnace drive structures, a driven gear is typically installed on the connecting shaft at the end of the drive roller, meshing with the relevant drive gear to drive the roller's rotation. Due to the large number of drive gears, this results in high initial investment costs. Therefore, a drive mechanism compatible with the aforementioned (wide-type) heating furnace is needed to ensure stable operation of the heating furnace's transport and processing.

[0005] Therefore, based on the above-mentioned technical problems, this application proposes a transmission mechanism for a heating furnace that has good transmission effect and low initial investment cost. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a transmission mechanism for a heating furnace with good transmission effect and low initial investment cost.

[0007] To achieve the above objectives, this utility model provides a transmission mechanism for a heating furnace, comprising a furnace body and multiple horizontally arranged transmission rollers. Each transmission roller has a connecting shaft at both ends and a transmission mechanism located on one side of the furnace body. The transmission mechanism includes multiple bearing seats, multiple primary driven sprockets, at least two secondary driven sprockets, at least two tertiary driven sprockets, at least one transmission chain, at least one driving sprocket, a primary drive unit, and a sprocket tensioning assembly. The bearing seats are horizontally arranged on one side of the furnace body. The transmission rollers are rotatably connected to the bearing seats via connecting shafts, and the connecting shaft passes through the bearing seats, with the primary driven sprockets mounted at the end of the connecting shaft. The primary drive unit is mounted on the sprocket tensioning assembly, and the driving sprocket is located at the output end of the primary drive unit. The two secondary driven sprockets are respectively arranged at positioning parts A and B on the side of the furnace body. The two secondary driven sprockets are positioned at the same vertical height on the same horizontal line. The tertiary driven sprocket is arranged on the positioning part C on the side of the furnace body. The transmission chain is fitted onto the driving sprocket and the two secondary driven sprockets. The tertiary driven sprocket on the positioning part C abuts against the outer side of the transmission chain, thereby forming a T-shaped transmission chain. Both the secondary and tertiary driven sprockets are used to cooperate with the driving sprocket to support the rotation of the transmission chain. The primary drive unit is used to drive the rotation of the transmission chain through the driving sprocket, thereby driving the rotation of the transmission roller. The sprocket tensioning assembly is used to adjust the meshing degree between the driving sprocket and the transmission sprocket to control the tension of the transmission chain within a preset range.

[0008] Furthermore, the furnace body is provided with C-shaped mounting parts on both sides, the transmission mechanism is mounted on the mounting parts, and the bottom of the mounting parts is formed with mounting grooves for positioning and mounting three-stage driven sprockets.

[0009] Furthermore, the sprocket tensioning assembly includes a secondary drive unit, a fixed plate, two primary rotating seats, at least one secondary rotating seat, and a bracket. The bracket consists of a primary connecting part, two secondary connecting parts, and a tertiary connecting part. There is an movable gap between the two secondary connecting parts for the transmission chain to move. The primary connecting parts and the secondary connecting parts are perpendicular to each other. The tertiary connecting part is located on one side of one of the secondary connecting parts.

[0010] Furthermore, the fixed end of the secondary drive unit is rotatably connected to the bottom surface of the mounting part, and its movable end is rotatably connected to the end of the primary connecting part. The fixed plate is fixedly installed on the bottom surface of the mounting part by a preset bolt. The primary rotating seat is invertedly installed on the fixed plate and is rotatably connected to the primary connecting part by a preset connecting pin. The secondary rotating seat is invertedly installed on the bottom surface of the secondary connecting part and is rotatably connected to the output shaft of the primary drive unit. The end of the tertiary connecting part is connected to the fixed end of the primary drive unit by a preset connecting pin.

[0011] Furthermore, the distance between adjacent drive rollers is 150 mm.

[0012] Furthermore, the transmission mechanism also includes a support frame and three support members. The support frame is mounted on the mounting part between the two secondary driven sprockets, and the support members are respectively mounted between the transmission chain and the support frame and between the transmission chain and the mounting part; the support members are used to support the normal operation of the transmission chain.

[0013] Furthermore, the transmission mechanism includes multiple bearing seats, multiple primary driven sprockets, two secondary driven sprockets, two sets of tertiary driven sprockets, two transmission chains, two driving sprockets, a primary drive unit, and a sprocket tensioning assembly. Each set of tertiary driven sprockets consists of two coaxially arranged tertiary driven sprockets, and the two driving sprockets are coaxially arranged on the output shaft of the primary drive unit. The two transmission chains are mounted side-by-side on the two driving sprockets and the two secondary driven sprockets, and the outer sides of the transmission chains abut against the two sets of tertiary driven sprockets, thus forming a T-shaped transmission chain. The secondary driven sprockets are coaxially arranged with a transmission structure for supporting the other transmission chain, and adjacent primary driven sprockets are staggered on the two transmission chains.

[0014] The present invention adopts the above-described solution, and its beneficial effects are as follows: By setting up a transmission chain and related driven sprockets, the transmission chain meshes with the driven sprockets at the end of the transmission roller connecting shaft, causing the transmission chain to drive the rotation of the transmission roller. This enables stable conveying of workpieces even under increased load, ensuring good transmission performance. Furthermore, the design of the transmission chain and related driven sprockets reduces initial investment costs and installation difficulty, as well as subsequent maintenance difficulty and costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the transmission mechanism in this embodiment.

[0016] Figure 2 for Figure 1 A magnified view of part A in the diagram.

[0017] Figure 3 This is a front view of the transmission mechanism in this embodiment.

[0018] Figure 4 This is a schematic diagram of the sprocket tensioning assembly in this embodiment.

[0019] Figure 5 This is a schematic diagram of the active sprocket and the first-stage drive unit in this embodiment.

[0020] Figure 6 This is a schematic diagram of the support structure in this embodiment.

[0021] Figure 7 This is a schematic diagram of the transmission mechanism in Embodiment 2.

[0022] Figure 8 This is a schematic diagram of the transmission mechanism in Embodiment 2.

[0023] Figure 9 for Figure 8 A magnified schematic diagram of part B in the image.

[0024] Figure 10 This is a schematic diagram of the active sprocket and the first-stage drive unit in this embodiment 2.

[0025] Figure 11 This is a schematic diagram of the support structure in Embodiment 2.

[0026] Among them, 1-furnace body, 11-installation part, 111-installation groove, 12-positioning part A, 13-positioning part B, 14-positioning part C, 2-drive roller, 3-drive mechanism, 31-bearing seat, 32-first-stage driven sprocket, 33-second-stage driven sprocket, 34-third-stage driven sprocket, 35-drive chain, 36-drive sprocket, 37-first-stage drive unit, 38-sprocket tensioning assembly, 381-second-stage drive unit, 382-fixed plate, 383-first-stage rotating seat, 384-second-stage rotating seat, 385-bracket, 3851-first-stage connecting part, 3852-second-stage connecting part, 3853-third-stage connecting part, 4-support frame, 5-support component, 6-movable gap. Detailed Implementation

[0027] To facilitate understanding of this utility model, a more complete description of it is provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0028] See appendix Figure 1-11As shown, in this embodiment, a transmission mechanism for a heating furnace includes a furnace body 1 and multiple transmission rollers 2 arranged horizontally. The roller spacing between adjacent transmission rollers 2 is 150 mm. Connecting shafts are provided at both ends of the transmission rollers 2. Because the overall structure of the heating furnace is large, it is generally assembled from multiple furnace bodies 1. The functions performed by furnace bodies 1 in different areas are different (such as performing multiple processes such as high-temperature treatment, room-temperature feeding, and heat preservation). Therefore, the transmission mechanism 3 provided in this embodiment only involves the transportation function of the furnace body 1. Secondly, the effective inner width of the traditional furnace body 1 is 2.3 meters or 2.5 meters, which is mainly for heat processing of traditional sheet metal or single-door ring sheet metal. However, it is insufficient to support production for double-door ring or transverse discharge single-door ring (the width cannot accommodate the transportation of double-door ring or transverse discharge single-door ring). Due to market demand, the effective width of the furnace body 1 has been optimized to 3.4 to 3.6 meters (the specific effective width can be set according to actual needs and can be further optimized later), which can meet the transportation needs of double-door ring or single-door ring with transverse discharge. However, the expansion of the effective width means that the length of the relevant transmission rollers 2 needs to be changed accordingly. In addition, the traditional transmission mechanism 3 may not be suitable for the optimized furnace body 1, and may have the disadvantages of excessive load on parts leading to failure and low production efficiency. Therefore, a transmission mechanism 3 that can be used and adapted to the furnace body 1 is needed to ensure stable operation of transportation and processing.

[0029] See appendix Figure 1-5 As shown, further, it also includes a transmission mechanism 3 disposed on one side of the furnace body 1. The transmission mechanism 3 includes multiple bearing seats 31, multiple primary driven sprockets 32, at least two secondary driven sprockets 33 (preferably two), at least two tertiary driven sprockets 34 (preferably two), at least one transmission chain 35 (preferably one), at least one driving sprocket 36 (preferably one), a primary drive unit 37, and a sprocket tensioning assembly 38. The number of the aforementioned primary driven sprockets 32 and bearing seats 31 is consistent with the number of transmission rollers 2. Specifically, if the transmission mechanism 3 is arranged on both sides of the furnace body 1, it is necessary to set the transmission mechanism 3 on both sides to rotate synchronously, which is more difficult to debug and install. In order to reduce the debugging and installation difficulty, this embodiment adopts a transmission mechanism 3 for actively providing power to be arranged on one side of the furnace body 1, and multiple bearing seats 31 that are rotatably connected to the transmission rollers 2 are arranged separately on the other side, so that the other side is the driven end. This avoids the need for precise calibration of the transmission mechanism 3 on both sides, which can relatively reduce the initial investment cost and the debugging and installation difficulty.

[0030] See appendix Figure 1-5As shown, the bearing housing 31 is arranged horizontally on one side of the furnace body 1. The transmission roller 2 is rotatably connected to the bearing housing 31 via a connecting shaft. After the connecting shaft passes through the bearing housing 31, the first-stage driven sprocket 32 ​​is installed at the end of the connecting shaft (a bearing is provided between the connecting shaft and the bearing housing 31). The first-stage drive unit 37 is mounted on the sprocket tensioning assembly 38, and the drive sprocket 36 is mounted on the output end of the first-stage drive unit 37. Two second-stage driven sprockets 33 are respectively arranged on the positioning parts A 12 and B 13 on the side of the furnace body 1, and the vertical heights of the two second-stage driven sprockets 33 are on the same horizontal line. The third-stage driven sprocket 34 is arranged on the positioning part C 14 on the side of the furnace body 1 (the positions of the positioning parts A 12, B 13 and C 14 are shown in the appendix). Figure 3 As shown), the transmission chain 35 is mounted on the driving sprocket 36 and two secondary driven sprockets 33, and the tertiary driven sprocket 34 on the positioning part C14 abuts against the outer side of the transmission chain 35, thus forming a T-shaped transmission chain 35. The transmission sprockets mounted between the secondary driven sprockets 33 form the flat end of the T-shaped structure, the transmission chain 35 abutting against the tertiary driven sprocket 34 and mounted on the driving sprocket 36 form the vertical end of the T-shaped structure. Both the secondary driven sprockets 33 and the tertiary driven sprockets 34 cooperate with the driving sprocket 36 to support the rotation of the transmission chain 35. The primary drive unit 37 drives the transmission chain through the driving sprocket 36. The rotation of 35 drives the rotation of the transmission roller 2 (the first-stage drive unit 37 is equipped with conventional mechanical structures such as a reducer, worm gear, and drive shaft, which are not specifically limited here); the sprocket tensioning assembly 38 is used to adjust the meshing degree between the drive sprocket 36 and the transmission sprocket to control the tension of the transmission chain 35 within a preset range. By setting the sprocket tensioning assembly 38, a good support can be provided for the loose chain during the transmission process of the transmission chain 35, which can effectively prevent the chain from slipping or falling off, and ensure the stable and orderly operation of the transmission mechanism 3.

[0031] It should be noted that in traditional kiln transmission structures, driven gears are generally installed on the connecting shaft at the end of the transmission roller 2, and the driven gears mesh with the relevant transmission gears to drive the rotation of the transmission roller 2. Due to the large number of relevant transmission gears, there are disadvantages such as high initial investment cost, high installation difficulty, and high subsequent maintenance difficulty and cost. In this embodiment, by setting a transmission chain 35 and relevant driven sprockets, the transmission chain 35 meshes with the driven sprockets at the end of the connecting shaft of the transmission roller 2, so that the transmission chain 35 drives the rotation of the transmission roller 2 to realize the function of conveying workpieces. The design of the transmission chain 35 and relevant driven sprockets relatively reduces the initial investment cost and installation difficulty, and reduces the subsequent maintenance difficulty and high maintenance cost.

[0032] See appendix Figure 1As shown, in this embodiment, C-shaped mounting portions 11 are provided on both sides of the furnace body 1, and the transmission mechanism 3 is mounted on the mounting portions 11. Because the internal temperature of the furnace body 1 is high during operation, it will have a certain impact on the operation of the transmission mechanism 3 (such as causing overheating and expansion of some parts, thereby reducing the transmission effect of the transmission mechanism 3). By setting the mounting portions 11 (the material of the mounting portions 11 is preferably heat-insulating material), a heat insulation function can be relatively achieved to ensure that the transmission mechanism 3 can operate in a relatively normal environment (temperature) and improve the stability of the mechanism operation. The bottom of the mounting portions 11 is formed with mounting grooves 111 for positioning and mounting the three-stage driven sprocket 34 (the mounting grooves 111 set based on the position layout of the sprocket tensioning component 38 and the transmission chain 35 can provide a clearance function).

[0033] See appendix Figure 4-6 As shown, the sprocket tensioning assembly 38 further includes a secondary drive unit 381, a fixed plate 382, ​​two primary rotating seats 383, at least one, preferably two, secondary rotating seats 384, and a bracket 385. The bracket 385 consists of a primary connecting part 3851, two secondary connecting parts 3852, and a tertiary connecting part 3853. A movable gap 6 is provided between the two secondary connecting parts 3852 for the transmission chain 35 to move. The primary connecting parts 3851 and the secondary connecting parts 3852 are perpendicular to each other. The tertiary connecting part 3853 is disposed on one side of one of the secondary connecting parts 3852. The fixed end of the secondary drive unit 381 is rotatably connected to the bottom surface of the mounting part 11, and its movable end is connected to a... The ends of the first-stage connecting part 3851 are rotatably connected. The fixing plate 382 is fixedly installed on the bottom surface of the mounting part 11 by a preset bolt. The first-stage rotating seat 383 is invertedly installed on the fixing plate 382 and is rotatably connected to the first-stage connecting part 3851 by a preset connecting pin. The second-stage rotating seat 384 is invertedly installed on the bottom surface of the second-stage connecting part 3852 and is rotatably connected to the output shaft of the first-stage drive unit 37. The end of the third-stage connecting part 3853 is connected to the fixed end of the first-stage drive unit 37 by a preset connecting pin, thereby stably fixing the first-stage drive unit 37 on the bracket 385 (both the first-stage rotating seat 383 and the second-stage rotating seat 384 are provided with bearings).

[0034] Specifically, based on the structure of the aforementioned sprocket tensioning assembly 38, with the connection position between the secondary connecting part 3852 and the primary rotating seat 383 as the rotation center, and the connection position between the secondary drive unit 381 and the primary connecting part 3851 as the rotation end, when the transmission chain 35 is too tight, the secondary drive unit 381 drives the movable end to retract, causing the bracket 385 to rotate clockwise as a whole. This causes the drive sprocket 36 on the primary drive unit 37 to move toward the location of the nearby tertiary driven sprocket 34, thereby adjusting the tension. The transmission chain 35 is too tight. When inspecting and maintaining the transmission sprocket and related sprockets, the transmission chain 35 can be removed for inspection and maintenance using the above method, and the related sprockets can also be inspected. Conversely, when the transmission chain 35 is too loose, the movable end of the secondary drive unit 381 is extended, causing the bracket 385 to rotate counterclockwise. This causes the drive sprocket 36 on the primary drive unit 37 to move toward the position of the third-stage driven sprocket 34, thereby adjusting the condition of the transmission chain 35 being too loose.

[0035] Furthermore, the transmission mechanism 3 also includes a support frame 4 and three support members 5. The support frame 4 is mounted on the mounting portion 11 between the two secondary driven sprockets 33. The support members 5 are respectively mounted between the transmission chain 35 and the support frame 4 and between the transmission chain 35 and the mounting portion 11. The support members 5 are used to support the normal operation of the transmission chain 35. When there is only one transmission chain 35, the structure of the support member 5 is shown in the appendix. Figure 6 As shown, the support member 5 has a convex structure, and the convex structure is used to support the transmission chain 35. Secondly, because the furnace body 1 is relatively long, the corresponding transmission chain 35 is also relatively long. In order to prevent the section of the transmission chain 35 between the two secondary driven sprockets 33 from sagging and failing to mesh with the corresponding primary driven sprocket 32, a support bracket 4 is provided and a support member 5 is installed on the support bracket 4 to support the section of the transmission chain 35, so as to ensure that the section of the transmission chain 35 can mesh with the primary driven sprocket 32. Similarly, in order to prevent the section of the transmission chain 35 between the secondary driven sprocket 33 and the tertiary driven sprocket 34 from sagging and affecting the normal transmission of the transmission chain 35, the support member 5 is provided on the mounting part 11 so that the support member 5 supports the section of the transmission chain 35, avoiding the transmission chain 35 from breaking due to excessive sagging and loosening, thereby reducing the maintenance costs.

[0036] This second embodiment differs from the first embodiment in the following aspects: (See Appendix) Figure 7-10As shown, the transmission mechanism 3 includes multiple bearing seats 31, multiple primary driven sprockets 32, two secondary driven sprockets 33, two sets of tertiary driven sprockets 34, two transmission chains 35, two driving sprockets 36, a primary drive unit 37, and a sprocket tensioning assembly 38. Each set of tertiary driven sprockets 34 consists of two coaxially arranged tertiary driven sprockets 34. The two driving sprockets 36 are coaxially arranged on the output shaft of the primary drive unit 37. The two transmission chains 35 are mounted side-by-side on the two driving sprockets 36 and the two secondary driven sprockets 33, with the outer sides of the transmission chains 35 abutting against the two sets of tertiary driven sprockets 34, thus forming a T-shaped transmission chain 35. A transmission structure for supporting another transmission chain 35 is coaxially arranged on the secondary driven sprocket 33, and the adjacent primary driven sprockets 32 are staggered on the two transmission chains 35, which can relatively reduce the load on each transmission chain 35, thereby improving transmission efficiency and adapting to the high-speed transmission requirements of some production processes (the number of transmission chains 35 can be selected according to the actual production situation to avoid the phenomenon of a single transmission chain 35 breaking due to excessive load in order to meet the high-speed transmission requirements under high load conditions, thus meeting the production requirements for the above-mentioned high-load and high-speed transmission requirements). Secondly, when the number of transmission chains 35 is two, the structure of the above-mentioned support member 5 is shown in the appendix. Figure 11 As shown, the support member 5 is concave. The concave part of the concave structure can accommodate the edge of the adjacent transmission chain 35, and the protrusions on both sides of the concave structure are used to support the transmission chain 35 (so that the support member 5 can better support the two transmission chains 35).

[0037] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Any modifications or alterations made by those skilled in the art to the technical solution of this utility model without departing from its scope are equivalent embodiments of this utility model. Therefore, all equivalent changes made based on the concept of this utility model without departing from its scope should be covered within the protection scope of this utility model.

Claims

1. A transmission mechanism for a heating furnace, comprising a furnace body (1) and a plurality of transmission rollers (2) arranged in a horizontal direction, wherein the two ends of the transmission rollers (2) are provided with connecting shafts, and further comprising a transmission mechanism (3) disposed on one side of the furnace body (1), characterized in that: The transmission mechanism (3) includes multiple bearing seats (31), multiple primary driven sprockets (32), at least two secondary driven sprockets (33), at least two tertiary driven sprockets (34), at least one transmission chain (35), at least one driving sprocket (36), a primary drive unit (37), and a sprocket tensioning assembly (38). The bearing seats (31) are arranged horizontally on one side of the furnace body (1). The transmission roller (2) is rotatably connected to the bearing seats (31) through a connecting shaft. After the connecting shaft passes through the bearing seats (31), the primary driven sprockets (32) are installed at the end of the connecting shaft. The primary drive unit (37) is set on the sprocket tensioning assembly (38). The driving sprocket (36) is set on the output end of the primary drive unit (37). The two secondary driven sprockets (33) are respectively arranged on the positioning part A (12) and positioning part B on the side of the furnace body (1). (13) and the vertical heights of the two secondary driven sprockets (33) are on the same horizontal line; the tertiary driven sprocket (34) is arranged on the positioning part C (14) on the side of the furnace body (1), the transmission chain (35) is fitted on the driving sprocket (36) and the two secondary driven sprockets (33), and the positioning part C The third-stage driven sprocket (34) on (14) abuts against the outer side of the transmission chain (35), thereby forming a T-shaped transmission chain (35). The second-stage driven sprocket (33) and the third-stage driven sprocket (34) are both used to cooperate with the driving sprocket (36) to support the rotation of the transmission chain (35). The first-stage drive unit (37) is used to drive the rotation of the transmission chain (35) through the driving sprocket (36), thereby driving the rotation of the transmission roller (2). The sprocket tensioning assembly (38) is used to adjust the meshing degree between the driving sprocket (36) and the transmission sprocket to control the tension of the transmission chain (35) within a preset range.

2. The transmission mechanism of a heating furnace according to claim 1, characterized in that: The furnace body (1) has C-shaped mounting parts (11) on both sides, and the transmission mechanism (3) is mounted on the mounting parts (11). The bottom of the mounting parts (11) is formed with mounting grooves (111) for positioning and mounting of the three-stage driven sprockets (34).

3. A drive mechanism for a furnace as claimed in claim 1, wherein: The sprocket tensioning assembly (38) includes a secondary drive unit (381), a fixed plate (382), two primary rotating seats (383), at least one secondary rotating seat (384), and a bracket (385). The bracket (385) is composed of a primary connecting part (3851), two secondary connecting parts (3852), and a tertiary connecting part (3853). There is an movable gap (6) between the two secondary connecting parts (3852) for the transmission chain (35) to move. The primary connecting part (3851) and the secondary connecting part (3852) are perpendicular to each other. The tertiary connecting part (3853) is disposed on one side of one of the secondary connecting parts (3852).

4. A drive mechanism for a furnace as claimed in claim 3, wherein: The fixed end of the secondary drive unit (381) is rotatably connected to the bottom surface of the mounting part (11), and its movable end is rotatably connected to the end of the primary connecting part (3851). The fixed plate (382) is fixedly installed on the bottom surface of the mounting part (11) by a preset bolt. The primary rotating seat (383) is invertedly installed on the fixed plate (382) and is rotatably connected to the primary connecting part (3851) by a preset connecting pin. The secondary rotating seat (384) is invertedly installed on the bottom surface of the secondary connecting part (3852) and is rotatably connected to the output shaft of the primary drive unit (37). The end of the tertiary connecting part (3853) is connected to the fixed end of the primary drive unit (37) by a preset connecting pin.

5. A drive mechanism for a furnace as defined in claim 1, wherein: The distance between adjacent drive rollers (2) is 150 mm.

6. The transmission mechanism of a heating furnace according to claim 1, characterized in that: The transmission mechanism (3) also includes a support frame (4) and three support members (5). The support frame (4) is installed on the mounting part (11) between two secondary driven sprockets (33). The support members (5) are respectively installed between the transmission chain (35) and the support frame (4) and between the transmission chain (35) and the mounting part (11). The support members (5) are used to support the normal operation of the transmission chain (35).

7. A drive mechanism for a furnace as defined in claim 1, wherein: The transmission mechanism (3) includes multiple bearing seats (31), multiple primary driven sprockets (32), two secondary driven sprockets (33), two sets of tertiary driven sprockets (34), two transmission chains (35), two driving sprockets (36), a primary drive unit (37), and a sprocket tensioning assembly (38). Each set of tertiary driven sprockets (34) consists of two coaxially arranged tertiary driven sprockets (34), and the two driving sprockets (36) are coaxially arranged within the primary drive unit (37). On the output shaft, two drive chains (35) are mounted side by side on two driving sprockets (36) and two secondary driven sprockets (33), and the outer side of the drive chain (35) abuts against two sets of tertiary driven sprockets (34), thereby forming a T-shaped drive chain (35). The secondary driven sprocket (33) has a coaxially arranged drive structure for supporting the other drive chain (35), and the adjacent primary driven sprockets (32) are staggered on the two drive chains (35).

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