Drag chain type multi-layer low-temperature tempering furnace

Abstract

A drag chain type multi-layer low-temperature tempering furnace is used for carrying out low-temperature tempering operation on bearings and steel ball type workpieces and comprises a furnace body, a heating element, an airflow circulation mechanism, a plurality of layers of chain belt brackets inside and outside a hearth, a plurality of chain belt driving mechanisms and a plurality of annular conveying chain belts. The heating element and the airflow circulation mechanism are arranged in the hearth, the multiple layers of in-hearth chain belt brackets and the multiple layers of out-hearth chain belt brackets are arranged in the hearth and below the furnace body respectively in an up-down stacked mode, and the two ends of each in-hearth chain belt bracket extend out of the feed port and the discharge port. The plurality of chain belt driving mechanisms are respectively arranged at two ends of each layer of in-hearth chain belt bracket corresponding to the plurality of layers of in-hearth chain belt brackets; and the plurality of annular conveying chain belts are respectively and sequentially sleeved on the in-hearth chain belt bracket, the out-hearth chain belt bracket and the chain belt driving mechanisms from near to far away from the bottom side wall of the furnace body. Therefore, the productivity of workpiece tempering operation can be improved by multiple times, and simultaneous tempering operation can be achieved while different tempering requirements of batch workpieces can be met.

Description

Technical Field

[0001] This utility model relates to the field of low-temperature tempering furnace technology, and in particular to a drag chain type multi-layer low-temperature tempering furnace. Background Technology

[0002] Currently, most drag chain low-temperature tempering furnaces are single-layer chain (mesh) belt structures. Due to space limitations in the operating area, the number of tempering stations in single-layer drag chain low-temperature tempering furnaces is limited, which cannot meet the needs of large-volume workpiece tempering operations, thus severely restricting production efficiency. Furthermore, the operating modes of existing low-temperature tempering furnaces are relatively simple, unable to meet the diverse tempering requirements of batches of workpieces in a short time. Therefore, how to provide a drag chain low-temperature tempering furnace with a small footprint, high capacity, and the ability to meet various tempering requirements of workpieces has become one of the urgent technical problems to be solved in this field. Utility Model Content

[0003] The technical problem to be solved by this technical solution is how to provide a drag chain type low temperature tempering furnace that is specifically designed for low temperature tempering of bearings and steel ball workpieces, has a small footprint, high production capacity, and can meet the various tempering requirements of batch workpieces.

[0004] To address the aforementioned technical problems, this technical solution provides a drag chain type multi-layer low-temperature tempering furnace for low-temperature tempering of bearings and steel ball workpieces. The drag chain type multi-layer low-temperature tempering furnace includes: a furnace body, several heating elements, an airflow circulation mechanism, multi-layer internal chain support brackets, multi-layer external chain support brackets, multiple chain drive mechanisms, and multiple annular conveyor chains. The furnace body has an internal furnace chamber, and the furnace body has inlet and outlet ports communicating with the furnace chamber on two opposite side walls along the axial direction of the furnace chamber. The heating elements and airflow circulation mechanism are all located inside the furnace chamber. The multi-layered internal chain belt brackets are stacked vertically and spaced apart within the furnace chamber. Each layer of the internal chain belt bracket extends from its inlet and outlet to the outside of the furnace body. The multi-layered external chain belt brackets are also stacked vertically and spaced apart below the furnace body. Multiple chain drive mechanisms are positioned at both ends of each internal chain belt bracket, corresponding to the multi-layered internal chain belt brackets. Multiple annular conveyor chains are sequentially mounted on the internal chain belt brackets, external chain belt brackets, and chain drive mechanisms, from closest to furthest from the bottom sidewall of the furnace body. This design allows for a significant increase in the production capacity of workpiece tempering operations without requiring additional space or consuming more energy. Furthermore, each annular conveyor chain can operate independently, enabling simultaneous tempering operations for batches of workpieces with varying tempering requirements.

[0005] In another implementation of this technical solution, the length of the inner chain support in each layer increases sequentially from bottom to top, the length of the outer chain support in each layer increases sequentially from top to bottom, and the circumference of each annular conveyor chain increases sequentially from the inside to the outside. This ensures that the transmission components of each annular conveyor chain are independent of each other, preventing operational interference.

[0006] As another implementation of this technical solution, the multi-layer external conveyor belt bracket is composed of several support columns and a multi-layer external support frame. Each layer of the external support frame consists of several support beams and two grooved rails. The support columns are vertically oriented and evenly and symmetrically arranged on both sides of the bottom sidewall of the furnace body along the axial direction of the furnace. The support beams of the multi-layer external support frame are horizontally oriented and fixedly arranged between corresponding pairs of support columns from bottom to top with spacing between them. The two grooved rails of each layer of the external support frame are parallel to each other along the axial direction of the furnace, with their grooves facing each other and with spacing between them, and are fixedly arranged on the upper part of the support beams of each layer of the external support frame. The lower section of the multiple annular conveyor belts on the outside of the furnace is slidably embedded in the two grooved rails of each layer of the external support frame. Accordingly, the stable operation of the lower section of the multiple annular conveyor belts can be ensured.

[0007] As another implementation of this technical solution, the multi-layer in-furnace chain support frame is composed of several pillars and a multi-layer in-furnace support frame. Each layer of the in-furnace support frame consists of several Π-shaped support beams and two chain tracks. The Π-shaped support beams are composed of a horizontal beam and two vertical beams connected to the two ends of the horizontal beam. The Π-shaped support beams of the bottom layer of the in-furnace support frame have their horizontal beams perpendicular to the axial direction of the furnace and spaced apart from each other, so that the lower ends of their two vertical beams are fixed to the upper sides of the bottom sidewall of the furnace. The Π-shaped support beams of the remaining layers of the in-furnace support frames are respectively connected by their two vertical beams. The lower end of the support is fixed to the upper end of the two vertical beams below, arranged in a sequential stacked manner from bottom to top. Several supports are vertically and evenly fixed between the crossbeams of the lowest layer of the inner furnace support and the bottom side wall of the furnace. The two chain rails of each inner furnace support are parallel to each other along the axial direction of the furnace, with their slots facing each other and spaced apart, and are fixed to the upper part of the crossbeams of each inner furnace support. Several sliding wheels are installed within the chain rails. The upper sections of the multiple annular conveyor belts are slidably embedded in the two chain rails of each inner furnace support and located above the sliding wheels. This ensures the stable operation of the upper sections of the multiple annular conveyor belts.

[0008] As another implementation of this technical solution, the drag chain type multi-layer low-temperature tempering furnace further includes: two support frames, which are respectively disposed on the outer sides of the feed inlet and discharge outlet. The interior of the support frames has a spacious installation space. The two ends of the multi-layer internal chain belt bracket located on the outer sides of the feed inlet and discharge outlet are fixedly connected to the two support frames. Sections of the multiple annular conveyor chains located on the outer sides of the feed inlet and discharge outlet are movably accommodated within the installation space. The multiple chain drive mechanisms are mounted on the two support frames and driven by the multiple annular conveyor chains. Accordingly, the support frames can provide mounting bases of different heights for the chain drive mechanisms and can strengthen the structural strength of the two ends of the internal chain belt bracket.

[0009] As another implementation of this technical solution, the chain drive mechanism consists of a geared motor, a driving chain guide roller, a driven chain guide roller, and an annular chain. The geared motor is mounted on one side of one of the support frames. The driving and driven chain guide rollers are horizontal and perpendicular to the extension direction of the inner chain support frame, respectively located at the two ends of the inner chain support frame near and away from the geared motor. Both ends of the driving and driven chain guide rollers are rotatably fixed to the support frame via bearings. Each of the driving and driven chain guide rollers has several teeth on its peripheral roller surface. The belt segments at both ends of the annular conveyor chain support frame cover part of the peripheral roller surfaces of the driving and driven chain guide rollers and mesh with their teeth. A sprocket is fixedly sleeved at the end of the driving chain guide roller near the geared motor. A drive sprocket is fixedly sleeved at the drive end of the geared motor. The sprocket and the drive sprocket are connected by an annular chain. Therefore, the ring conveyor belt can be driven to operate stably.

[0010] As another implementation of this technical solution, the drag chain type multi-layer low-temperature tempering furnace further includes: a feed end protective cover and a discharge end protective cover. Both the feed end protective cover and the discharge end protective cover are assembled from structural steel, steel plates, and connecting parts. The feed end protective cover and the discharge end protective cover are respectively installed on the outside of the support frame at the feed inlet and discharge outlet and connected to the furnace body. This protects the tempering environment inside the furnace and reduces the impact of the external environment on the furnace temperature uniformity.

[0011] As another implementation of this technical solution, the drag chain type multi-layer low-temperature tempering furnace further includes: a feeding mechanism, which is located outside the feed inlet and consists of a hopper lifting device, a ball-separating device, and several material distribution channels. The hopper lifting device consists of a hopper and a lifting unit, which lifts the bearings and steel ball workpieces to be tempered in the hopper to a height higher than the uppermost inner-chamber chain support frame. The ball-separating device is located below the hopper after the lifting height. The feed ends of the several material distribution channels are connected to the ball-separating device, and the discharge ends of the several material distribution channels are respectively located at the feed ends of the multi-layer inner-chamber chain support frame, with the height of the feed ends of the several material distribution channels higher than the height of their discharge ends. The ball-separating device receives the bearings and steel ball workpieces conveyed by the hopper and selectively transports them into the material distribution channels. Accordingly, manual operation costs can be saved, and the efficiency of the feeding operation can be improved.

[0012] As another implementation of this technical solution, the drag chain type multi-layer low-temperature tempering furnace further includes: a discharge mechanism, which is located outside the discharge port and consists of several pushing devices and several unloading channels. The pushing devices are respectively located on one side of the discharge end of the multi-layer inner chain conveyor, and the inlet ends of the unloading channels are respectively located on the other side of the discharge end of the multi-layer inner chain conveyor. The discharge ends of the unloading channels are connected to a collection device or the next process device, and the height of the inlet ends of the unloading channels is higher than the height of their discharge ends. Therefore, manual operation costs can be saved, and the efficiency of the discharge operation can be improved.

[0013] As another implementation of this technical solution, the drag chain type multi-layer low-temperature tempering furnace further includes a central control unit, which is electrically connected to the heating element, the airflow circulation mechanism, the chain drive mechanism, the lifting unit, the ball separating device, and the pushing device. This enables automated operation of the drag chain type multi-layer low-temperature tempering furnace, improving the efficiency of workpiece tempering operations. Attached Figure Description

[0014] Figure 1 This is a side sectional view of the drag chain type multi-layer low-temperature tempering furnace of this utility model.

[0015] Figure 2 This is a top sectional view of the drag chain type multi-layer low-temperature tempering furnace of this utility model.

[0016] Figure 3 This is a cross-sectional view of the drag chain type multi-layer low-temperature tempering furnace of this utility model.

[0017] Explanation of symbols in the attached diagram:

[0018] 1 Furnace body; 11 Furnace chamber; 12 Feed inlet; 13 Discharge outlet; 14 Heating element; 15 Heat-resistant fan; 16 Top air guide plate; 17 Side air guide plate; 2 Inner furnace chain support bracket; 21 Support column; 22 Ώ-shaped support beam; 221 Horizontal beam; 222 Vertical beam; 23 Chain track; 231 Sliding wheel; 3 Outer furnace chain support bracket; 31 Support column; 32 Support beam; 33 Groove track; 4 Chain drive mechanism; 41 Gear motor; 42 Driven chain guide roller; 43 Driven chain guide roller; 44 Circular chain; 5 Circular conveyor chain; 51 Lower section; 52 Upper section; 6 Bearing frame; 71 Feed end protective cover; 72 Discharge end protective cover; 81 Feeding mechanism; 811 Hopper; 812 Lifting unit; 813 Ball separating device; 814 Material separating channel; 82 Discharge mechanism; 821 Unloading channel; 9 Collection equipment or equipment for the next process. Detailed Implementation

[0019] The detailed description and technical content of this utility model are explained below with reference to the accompanying drawings. However, the accompanying drawings are provided for reference and illustration only and are not intended to limit this utility model.

[0020] In the context of this specification, any two or more embodiments of this utility model can be arbitrarily combined, and the resulting technical solutions are part of the original disclosure of this specification and also fall within the protection scope of this utility model.

[0021] like Figure 1 , 2Figure 3 shows a schematic diagram of a specific embodiment of the drag chain type multi-layer low-temperature tempering furnace of this utility model. The drag chain type multi-layer low-temperature tempering furnace of this utility model (hereinafter referred to as the low-temperature tempering furnace) is a tempering furnace used for low-temperature tempering of bearings and steel ball workpieces with circular diameters. It includes a furnace body 1, several heating elements 14, an airflow circulation mechanism, a multi-layer inner chain support 2, a multi-layer outer chain support 3, multiple chain drive mechanisms 4, and multiple annular conveyor chains 5. The furnace body 1 is composed of a furnace shell and a furnace lining. It is roughly rectangular in shape and has a rectangular furnace chamber 11 formed inside it along its long side. The furnace body 1 has a feed port 12 and a discharge port 13 communicating with the furnace chamber 11 on two opposite side walls along the axial direction of the furnace chamber 11. Since the low-temperature tempering furnace of this utility model is a low-temperature tempering device, it does not require the workpiece to be heated and tempered in a protective gas atmosphere. Therefore, no furnace door device is provided at the feed port 12 and the discharge port 13. The heating elements 14 and the airflow circulation mechanism are all disposed within the furnace chamber 11. The heating elements 14 are horizontally inserted into the furnace chamber 11 and are respectively located above and below the cable conveyor. The airflow circulation mechanism consists of multiple heat-resistant fans 15, a top air guide plate 16 with multiple air guide holes corresponding to the heat-resistant fans 15, and side air guide plates 17 on both sides. The heat-resistant fans 15 are installed on the top side wall of the furnace chamber 11. The top air guide plate 16 and the side air guide plates 17 are spliced ​​and covered on the cable conveyor, with the air guide holes aligned with the heat-resistant fans 15, thereby making the furnace temperature more uniform. The above-described furnace body 1, heating elements 14, and airflow circulation mechanism are commonly used structures in various existing furnace types, therefore, this utility model will not describe them in detail.

[0022] The unique feature of this invention is that the multi-layered internal chain support 2 is stacked vertically and spaced apart within the furnace chamber 11, with each layer of the internal chain support 2 extending from the feed inlet 12 and the discharge outlet 13 to the outer side of the furnace body 1. The multi-layered external chain support 3 is also stacked vertically and spaced apart below the furnace body 1. The multiple chain drive mechanisms 4 are respectively installed on each layer of the internal chain support 2. At both ends, the multiple annular conveyor belts 5 are sequentially mounted on the inner chain support 2, the outer chain support 3, and the chain drive mechanism 4, respectively, from near to far from the bottom side wall of the furnace body 1. The length of each inner chain support 2 increases sequentially from bottom to top, the length of each outer chain support 3 increases sequentially from top to bottom, and the circumference of each annular conveyor belt 5 increases sequentially from inside to outside. This ensures that the transmission components of each annular conveyor belt 5 are independent of each other, so as to prevent interference between them.

[0023] Specifically, the multi-layer external chain support bracket 3 of this utility model is composed of several support columns 31 and a multi-layer external support structure. Each layer of the external support structure is composed of several support beams 32 and two groove rails 33. The several support columns 31 are vertically oriented and evenly and symmetrically arranged on both sides of the bottom side wall of the furnace body 1 along the axial direction of the furnace 11. The several support beams 32 of the multi-layer external support structure are horizontally oriented and fixedly arranged from bottom to top with intervals between them. Between the two support columns 31, the two groove rails 33 of each layer of the outer frame are parallel to each other along the axial direction of the furnace 11 and the grooves are opposite each other and spaced apart. They are fixedly installed on the upper part of several support beams 32 of each layer of the outer frame. The lower section 51 of the multiple annular conveyor belts 5 on the outside of the furnace 11 is slidably embedded in the two groove rails 33 of each layer of the outer frame. This ensures the stable operation of the lower section 51 of the multiple annular conveyor belts 5 and prevents it from derailing and running off course. The multi-layer in-furnace chain support 2 of this utility model is composed of several pillars 21 and a multi-layer in-furnace support structure. Each layer of the in-furnace support structure is composed of several Π-shaped support beams 22 and two chain rails 23. The Π-shaped support beams 22 are composed of a horizontal beam 221 and two vertical beams 222 connected to the two ends of the horizontal beam 221. In the lowest layer of the in-furnace support structure, the Π-shaped support beams 22 have their horizontal beams 221 perpendicular to the axial direction of the furnace 11 and spaced apart from each other, so that the lower ends of their two vertical beams 222 are fixed to the upper sides of the inner bottom sidewall of the furnace 11. In the other layers of the in-furnace support structure, the Π-shaped support beams 22 have their lower ends of their two vertical beams 222 fixed to the two lower vertical beams 222. The upper part of the 2 is arranged in a sequential stacked manner from bottom to top. Several support columns 21 are vertically and evenly fixed between several crossbeams 221 of the lowest layer of the inner frame and the bottom side wall of the furnace 11. The two chain rails 23 of each layer of the inner frame are parallel to each other along the axial direction of the furnace 11, with their slots facing each other and spaced apart, and are fixed on the upper part of several crossbeams 221 of each layer of the inner frame. Several sliding wheels 231 are provided in the chain rails 23. The upper belt segment 52 of the multiple annular conveyor belts 5 is slidably embedded in the two chain rails 23 of each layer of the inner frame and is located above the sliding wheels 231, thereby ensuring the stable operation of the upper belt segment 52 of the multiple annular conveyor belts 5 and preventing it from derailing and running off course. Figure 1 and Figure 3 As shown, the external chain support 3 and the internal chain support 2 of this utility model each have three layers, and the number of annular conveyor chains 5 is three. However, this utility model does not limit the number of external chain support 3, internal chain support 2 and annular conveyor chains 5, and the number can be two or more than three.

[0024] The low-temperature tempering furnace of this utility model may further include two support frames 6 respectively disposed on the outside of the feed inlet 12 and the discharge outlet 13. The support frames 6 may be constructed by welding or other means using multiple steel pipes, steel columns or steel beams of different lengths. The interior of the support frame 6 has a spacious installation space (not shown in the figure). The two ends of the multi-layer in-chamber chain support 2 located on the outside of the feed inlet 12 and the discharge outlet 13 are respectively fixedly connected to the two support frames 6. The sections of the multiple annular conveyor chains 5 located on the outside of the feed inlet 12 and the discharge outlet 13 are movably accommodated in the installation space. The multiple chain drive mechanisms 4 are mounted on the two support frames 6 and driven by the multiple annular conveyor chains 5. Accordingly, the arrangement of the support frames 6 can provide mounting bases of different heights for the chain drive mechanisms 4 and can strengthen the structural strength of the two ends of the in-chamber chain support 2. This invention does not limit the specific structure of the support frame 6. Any frame structure that can cover the end of the multi-layer inner chain support 2 extending out of the furnace body 1 and accommodate the running of the annular conveyor chain 5 can be used as the support frame 6 in this invention. In addition, on both sides of the space inside the two support frames 6, multiple inclined chain grooves (not shown in the figure) can be provided to fit the belt segments of the multiple annular conveyor chains 5, thereby further assisting the stable operation of the multiple annular conveyor chains.

[0025] Furthermore, the chain drive mechanism 4 in this invention can be composed of a reduction motor 41, a driving chain guide roller 42, a driven chain guide roller 43, and an annular chain 44. The reduction motor 41 is mounted on one side of one of the support frames 6. The driving chain guide roller 42 and the driven chain guide roller 43 are horizontally oriented and perpendicular to the extending direction of the inner chain support 2, respectively located at the two ends of the inner chain support 2 near and away from the reduction motor 41. Both ends of the driving chain guide roller 42 and the driven chain guide roller 43 are rotatably fixed to the support frame 6 via bearings (not shown in the figure). Both the driving chain guide roller 42 and the driven chain guide roller 43 have several teeth on their peripheral roller surfaces (not shown in the figure). The belt segments at both ends of the ring conveyor belt 5 inside the chain belt bracket 2 respectively cover part of the peripheral roller surfaces of the driving chain guide roller 42 and the driven chain guide roller 43 and mesh with their teeth. A sprocket (not shown in the figure) is fixedly sleeved on one end of the driving chain guide roller 42 near the reduction motor 41. A drive sprocket (not shown in the figure) is fixedly installed on the drive end of the reduction motor 41. The sprocket and the drive sprocket are driven and connected by a ring chain 44, thereby driving the ring conveyor belt 5 to operate stably.

[0026] The low-temperature tempering furnace of this utility model may further include a feed end protective cover 71 and a discharge end protective cover 72. Both the feed end protective cover 71 and the discharge end protective cover 72 are assembled from structural steel, steel plates, and connecting parts, or directly constructed from steel plates through welding. The feed end protective cover 71 and the discharge end protective cover 72 are respectively installed on the outside of the support frame 6 at the feed inlet 12 and the discharge outlet 13, and are connected to the furnace body 1. This protects the tempering environment inside the furnace chamber 11 and reduces the impact of the external environment on the furnace temperature uniformity. Alternatively, the feed end protective cover 71 and the discharge end protective cover 72 can also be directly installed on the outside of the support frame 6, allowing the support frame 6 to act as the framework for the protective cover, thereby improving its structural strength.

[0027] The low-temperature tempering furnace of this utility model may further include a feeding mechanism 81 and a discharging mechanism 82. The feeding mechanism 81 is located outside the feed inlet 12 and consists of a hopper lifting device, a ball-distributing device 813, and several distributing channels 814. The hopper lifting device consists of a hopper 811 and a lifting unit 812. The lifting unit 812 lifts the bearings and steel balls to be tempered in the hopper 811 to a height higher than the uppermost inner-chamber chain support 2. The ball-distributing device 813 is located below the hopper 811 after the lifting height. The several distributing channels 814... The feed end of the feed channel 814 is connected to the ball-separating device 813. The discharge ends of the feed channels 814 are respectively located at the feed ends of the multi-layer bore-mounted chain support 2, and the height of the feed ends of the feed channels 814 is higher than the height of their discharge ends. The ball-separating device 813 receives the bearings and steel balls conveyed by the hopper 811 and selectively transports the bearings and steel balls into the feed channels 814, thereby saving labor costs and improving the efficiency of the loading operation. Several electrically controlled doors (not shown in the figure) are correspondingly installed at the positions where the ball-separating device 813 connects to the feed ends of the feed channels 814. By controlling the opening and closing of the electrically controlled doors, the bearings and steel balls can be rolled down under gravity and transported to the corresponding feed ends of the bore-mounted chain support 2. The discharge mechanism 82 is located outside the discharge port 13 and consists of several pushing devices (not shown in the figure) and several unloading channels 821. The pushing devices are respectively located on one side of the discharge end of the multi-layer internal chain support 2, and the inlet ends of the unloading channels 821 are respectively located on the other side of the discharge end of the multi-layer internal chain support 1. The discharge ends of the unloading channels 821 are connected to the collection equipment or the next process equipment 9, and the height of the inlet ends of the unloading channels 821 is higher than the height of their discharge ends. This further saves on manual operation costs and improves the efficiency of the discharge operation. The pushing device can be composed of an electrically controlled telescopic cylinder. In addition, the feeding mechanism 81 and the discharging mechanism 82 can both be set on the outside of the feed end protective cover 71 and the discharge end protective cover 72. The pushing device can be installed on the support frame 6. The material distribution channel 814 and the unloading channel 821 can pass through the feed end protective cover 71 and the discharge end protective cover 72.

[0028] The low-temperature tempering furnace of this invention may further include a central control unit (not shown in the figure). This central control unit is electrically connected to the heating element, heat-resistant fan, geared motor, lifting unit, electrically controlled door of the ball-separating device, top-pushing device, and various sensors inside the furnace, thereby realizing the automated operation of the low-temperature tempering furnace and improving the efficiency of workpiece tempering. The central control unit in this invention can be composed of a programmable logic controller (PLC) or a microcontroller (MCU). Using the aforementioned simple and technologically mature automated control circuit can significantly improve the automation level of the low-temperature tempering furnace, reduce labor costs, and ensure the uniform quality of workpiece tempering operations. Given that the application of programmable logic controllers or microcontrollers to control the operating status of various components according to set instructions and sensor detection data has long been a widely used and common control mode in the field of automation control, and is the existing control technology, the process of using a central control unit to control the operating status of the low-temperature tempering furnace in this invention will not be described in detail.

[0029] In summary, the low-temperature tempering furnace of this invention can increase the production capacity of workpiece tempering operations many times over without occupying additional space or consuming more energy; moreover, each annular conveyor belt can operate independently, thereby achieving different step conveying speeds, which can meet the simultaneous tempering operations of batch workpieces with different tempering requirements.

[0030] The above are merely preferred embodiments of the present utility model and are not intended to limit the patent scope of the present utility model. Other equivalent changes made using the patent concept of the present utility model should all fall within the patent protection scope of the present utility model.

Claims

1. A cable-chain type multi-layer low-temperature tempering furnace for performing low-temperature tempering operations on bearings and steel ball workpieces, comprising: The furnace body comprises a furnace body, several heating elements, and an airflow circulation mechanism. The furnace body has a furnace chamber inside. The furnace body has an inlet and an outlet communicating with the furnace chamber on two opposite side walls along the axial direction of the furnace chamber. The heating elements and airflow circulation mechanism are all disposed within the furnace chamber. The furnace body is characterized by further comprising: multi-layered internal chain support brackets, multi-layered external chain support brackets, multiple chain drive mechanisms, and multiple annular conveyor chains. The multi-layered internal chain support brackets are stacked vertically and spaced apart within the furnace chamber. Inside, both ends of the inner chain support frame of each layer extend from the feed port and the discharge port to the outside of the furnace body. The multi-layer outer chain support frame is also stacked vertically and spaced apart from each other and is set below the furnace body. The multiple chain drive mechanisms are respectively set at both ends of the inner chain support frame of each layer, corresponding to the multi-layer inner chain support frame. The multiple annular conveyor chains are respectively sleeved on the inner chain support frame, outer chain support frame and chain drive mechanism from near to far from the bottom side wall of the furnace body.

2. The drag chain type multi-layer low-temperature tempering furnace according to claim 1, characterized in that, The length of the inner chain support brackets in each layer increases sequentially from bottom to top, the length of the outer chain support brackets in each layer increases sequentially from top to bottom, and the circumference of each ring conveyor chain increases sequentially from inside to outside.

3. The drag chain type multi-layer low-temperature tempering furnace according to claim 1, characterized in that, The multi-layer external conveyor belt bracket is composed of several support columns and multiple layers of external support structures. Each layer of the external support structure consists of several support beams and two grooved rails. The support columns are vertically oriented and evenly and symmetrically arranged on both sides of the bottom sidewall of the furnace body along the axial direction of the furnace. The support beams of the multi-layer external support structure are horizontally oriented and fixedly arranged between each corresponding pair of support columns from bottom to top with spacing between them. The two grooved rails of each layer of the external support structure are parallel to each other along the axial direction of the furnace, with their grooves facing each other and spaced apart, and are fixedly arranged on the upper part of the support beams of each layer of the external support structure. The multiple annular conveyor belts on the lower part of the outer side of the furnace are slidably embedded in the two grooved rails of each layer of the external support structure.

4. The drag chain type multi-layer low-temperature tempering furnace according to claim 1, characterized in that, The multi-layer in-furnace chain support frame is composed of several support columns and multiple layers of in-furnace support frames. Each layer of the in-furnace support frame consists of several Π-shaped support beams and two chain tracks. Each Π-shaped support beam is composed of a horizontal beam and two vertical beams connected to both ends of the horizontal beam. In the lowest layer of the in-furnace support frame, the Π-shaped support beams have their horizontal beams perpendicular to the axial direction of the furnace and spaced apart, with the lower ends of their two vertical beams fixed to the upper sides of the bottom sidewall of the furnace. In the remaining layers of the in-furnace support frames, the Π-shaped support beams have their lower ends of their two vertical beams fixed to the upper sides of the bottom sidewall of the furnace. The two vertical beams at the bottom are arranged in a sequential stacked manner from bottom to top. The several pillars are vertically and evenly fixed between the several horizontal beams of the lowest layer of the inner frame and the bottom side wall of the furnace. The two chain rails of each layer of the inner frame are parallel to each other along the axial direction of the furnace, with their slots facing each other and spaced apart, and are fixed on the upper part of the several horizontal beams of each layer of the inner frame. Several sliding wheels are provided in the chain rails. The upper part of the multiple annular conveyor belts is slidably embedded in the two chain rails of each layer of the inner frame and is located above the sliding wheels.

5. The drag chain type multi-layer low-temperature tempering furnace according to claim 1, characterized in that, Also includes: Two support frames are respectively disposed on the outside of the feed inlet and the discharge outlet. The interior of the support frames has a spacious setting space. The two ends of the multi-layer internal chain belt bracket located on the outside of the feed inlet and the discharge outlet are respectively fixedly connected to the two support frames. The portion of the multiple annular conveyor belt located on the outside of the feed inlet and the discharge outlet is movably accommodated within the setting space. The multiple chain belt drive mechanisms are mounted on the two support frames and are driven and connected to the multiple annular conveyor belts.

6. The drag chain type multi-layer low-temperature tempering furnace according to claim 5, characterized in that, The chain drive mechanism consists of a geared motor, a driving chain guide roller, a driven chain guide roller, and an annular chain. The geared motor is mounted on one side of one of the support frames. The driving and driven chain guide rollers are horizontal and perpendicular to the extension direction of the in-chamber chain support, respectively located at the two ends of the in-chamber chain support near and away from the geared motor. Both ends of the driving and driven chain guide rollers are rotatably fixed to the support frame via bearings. Each driving and driven chain guide roller has several teeth on its peripheral roller surface. The belt segments of the annular conveyor chain at both ends of the in-chamber chain support cover portions of the peripheral roller surfaces of the driving and driven chain guide rollers and mesh with their teeth. A sprocket is fixedly fitted onto the end of the driving chain guide roller near the geared motor. A drive sprocket is fixedly fitted onto the drive end of the geared motor. The sprocket and drive sprocket are connected by the annular chain.

7. The drag chain type multi-layer low-temperature tempering furnace according to claim 5, characterized in that, Also includes: The feed end protective cover and the discharge end protective cover are both assembled from structural steel, steel plates and connecting parts. The feed end protective cover and the discharge end protective cover are respectively installed on the outside of the support frame at the feed port and the discharge port and are connected to the furnace body.

8. The drag chain type multi-layer low-temperature tempering furnace according to claim 1, characterized in that, Also includes: The feeding mechanism is located outside the feed inlet and consists of a hopper lifting device, a ball-separating device, and several feeding channels. The hopper lifting device consists of a hopper and a lifting unit. The lifting unit lifts the bearings and steel ball workpieces to be tempered in the hopper to a height higher than the uppermost internal chain support frame. The ball-separating device is located below the hopper after the lifting height. The feed ends of the several feeding channels are connected to the ball-separating device. The discharge ends of the several feeding channels are respectively located at the feed ends of the multi-layer internal chain support frame, and the height of the feed ends of the several feeding channels is higher than the height of their discharge ends. The ball-separating device receives the bearings and steel ball workpieces conveyed by the hopper and selectively feeds the bearings and steel ball workpieces into the feeding channels.

9. The drag chain type multi-layer low-temperature tempering furnace according to claim 8, characterized in that, Also includes: The discharge mechanism is located outside the discharge port and consists of several pushing devices and several unloading channels. The pushing devices are respectively located on one side of the discharge end of the multi-layer internal chain belt bracket, and the inlet ends of the unloading channels are respectively located on the other side of the discharge end of the multi-layer internal chain belt bracket. The discharge ends of the unloading channels are connected to the collection equipment or the next process equipment, and the height of the inlet end of the unloading channels is higher than the height of their discharge ends.

10. The drag chain type multi-layer low-temperature tempering furnace according to claim 9, characterized in that, Also includes: The central control unit is electrically connected to the heating element, the airflow circulation mechanism, the chain drive mechanism, the lifting part, the ball distribution device, and the pushing device.

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