Waste heat efficient recovery system of steel rolling bar cooling bed

Abstract

The invention discloses a steel rolling bar cooling bed waste heat efficient recovery system which comprises a cooling bed body waste heat recovery device and a cold air cooling device, the waste heat recovery device comprises a supporting frame and a supporting top plate, the supporting top plate is installed above the supporting frame, and the supporting top plate is perpendicular to the moving direction of a cooling bed body for transferring bars. A plurality of lifting modules are installed on the supporting top plate at equal intervals, a connecting support is installed on each lifting module, a telescopic pipe is installed on each connecting support, a heat collecting cover is installed at the lower end of each telescopic pipe, the upper end of each telescopic pipe is connected with a waste heat recoverer through the corresponding heat collecting pipe, and the waste heat recoverer is installed on the supporting top plate. The waste heat recoverer is connected with a circulating pipe through a heat conduction pipe, an induced draft fan is installed on the heat conduction pipe, a recooler is installed on the circulating pipe, and the circulating pipe is communicated with a cold air cooling device. The practicability of the device is enhanced, the recycling rate of heat energy can be increased, and efficient recycling of the heat energy is achieved.

Description

Technical Field

[0001] This invention belongs to the field of steelmaking process technology, specifically relating to a high-efficiency waste heat recovery system for a steel bar cooling bed. Background Technology

[0002] The bar cooling bed is a key auxiliary device in the metallurgical steel rolling industry used to cool rolled products (such as rebar, round steel, and steel pipes). It primarily cools the high-temperature bars output from the rolling mill (typically from 900℃ to 100-300℃) through a conveying and cooling process, bringing them to the requirements for subsequent processing or storage. The structure of the bar cooling bed mainly consists of the following parts: **Bed Body:** As the main support structure, it bears the rolled workpiece and ensures its smooth movement. The bed body typically includes a fixed rack support and a movable rack support (in rack-and-pinion cooling beds). The inclined arrangement (e.g., at a 3°-5° angle to the stepping direction) eliminates cooling black marks and reduces phase transformation bending. **Transmission System:** Provides power to drive the cooling bed. Common forms include an AC variable frequency motor driving the input roller conveyor, or a hydraulic / electric system driving the skirts, racks, and other components. The transmission system must meet speed control requirements to adapt to the production of bars of different specifications. **Braking Device:** Used to control the bar speed and ensure accurate positioning. For example, the input roller conveyor achieves deceleration through its tilt angle (0° to 12° transition) and brake plates, while the tail brake, in conjunction with clamping devices (such as a tail brake), smoothly reduces the speed of high-speed bars. Auxiliary components include the input roller conveyor (188mm diameter rollers, often inlaid with wear-resistant alloy sleeves), lifting skirts (inlaid with wear-resistant liners), straightening plates, and end-aligning rollers. These components work together to optimize cooling efficiency and product surface quality. During the cooling process of hot-rolled bars, the cooling bed releases a large amount of heat. If this heat is not recovered and utilized, it will not only be wasted but also cause significant pollution to the production environment. Currently, to avoid the recovery and utilization of heat energy above the cooling bed, the existing waste heat recovery system mainly includes several blowers spaced apart on the low-temperature side of the cooling bed, and several heat exchangers spaced apart on the high-temperature side of the cooling bed. Each blower and each heat exchanger is arranged opposite to each other. The blowers send high-temperature hot air into the heat exchangers for heat exchange, and the cooled air returns to the blowers on the low-temperature side of the cooling bed, forming an airflow heat exchange cycle above the cooling bed between the blowers and the heat exchangers. This waste heat recovery device has the following shortcomings during use: First, it requires the cooling bed to be properly utilized. The structure and position of the heat radiation hood on the high-temperature side are fixed. During heat collection, the fixed structure and position of the hood prevent adjustment of its height and radiation area, severely limiting its use and hindering efficient heat recovery. Secondly, the existing waste heat recovery devices have an unreasonable structural layout. All collected heat is fed into a waste heat boiler for recovery, which has low heat exchange efficiency and a low waste heat recovery rate. The air after heat exchange still has a high thermal energy content, which negatively impacts the cooling effect and efficiency of the steel bars. Therefore, it is objectively necessary to develop a high-efficiency waste heat recovery system for steel rolling bar cooling beds that has a reasonable structural design, strong practicality, and can improve both heat collection efficiency and heat recovery utilization. Summary of the Invention

[0003] In order to solve the technical problems of poor practicality of thermal radiation covers and low waste heat recovery and utilization rate in the background technology, the purpose of this invention is to provide a high-efficiency waste heat recovery system for steel rolling bar cooling beds with reasonable structural design, strong practicality, and the ability to improve both heat collection effect and heat energy recovery and utilization rate.

[0004] The objective of this invention is achieved as follows: It includes a cooling bed body, a waste heat recovery device on one side of the high-temperature zone of the cooling bed body, and a cold air cooling device on one side of the low-temperature zone of the cooling bed body. The waste heat recovery device includes a support frame and a support top plate. The support frame is erected above the cooling bed body, and the support top plate is installed above the support frame. The support top plate is arranged perpendicular to the moving direction of the moving bar of the cooling bed body. Multiple sets of lifting modules are installed at equal intervals on the support top plate. Each set of lifting modules is equipped with a connecting bracket, and a telescopic pipe is installed on the connecting bracket. A heat collection cover is installed at the lower end of the telescopic pipe, and a waste heat recovery device is connected to the upper end of the telescopic pipe through the heat collection pipe. The waste heat recovery device is installed on the support top plate and connected to a circulation pipe through a heat conduction pipe. An induced draft fan is installed on the heat conduction pipe, and a recooler is installed on the circulation pipe. The circulation pipe is connected to the cold air cooling device.

[0005] Furthermore, the heat collection cover includes a fixed cover body and a first movable cover body and a second movable cover body movably installed at both ends of the fixed cover body. Two sets of telescopic adjustment assemblies are symmetrically installed on both sides of the top between the first movable cover body and the second movable cover body. Each telescopic adjustment assembly includes a first positioning seat, a second positioning seat, a positioning rod, and a positioning block. The first positioning seat is installed on the top of the first movable cover body, and the second positioning seat is installed on the top of the second movable cover body and is opposite to the first positioning seat. The second positioning seat has a positioning hole machined on it. One end of the positioning rod is fixedly installed to the first positioning seat, and the other end of the positioning rod passes through the first positioning seat. The positioning hole is configured such that a spring is installed on the positioning rod between the first positioning seat and the second positioning seat. The positioning block is slidably installed on the positioning rod on the side away from the spring. The top of the second movable cover is equipped with a pressing mechanism that slides in contact with the positioning block. The pressing mechanism includes a cylinder and a pressing slider. The top of the second movable cover is equipped with a support plate. There are two cylinders located on both sides of the positioning rod. The pressing slider is slidably installed on the positioning rod. The fixed end of the cylinder is fixedly installed on the support plate. The movable end of the cylinder is fixedly connected to the pressing slider. A limit block is installed at the end of the positioning.

[0006] Furthermore, the waste heat recovery includes an outer shell and an inner shell. The inner shell is installed inside the outer shell at intervals. The top and bottom of the inner shell are sealed to the top and bottom of the outer shell, respectively. A middle partition is vertically arranged inside the inner shell, with its top sealed to the top of the inner shell and a gap between its bottom and the bottom of the inner shell. The cavity between the inner and outer shells is a heat exchange chamber. Multiple baffles are staggered inside the heat exchange chamber. Multiple rows of heat exchange tubes communicating with the heat exchange chamber are arranged on the inner shell on both sides of each baffle, and the heat exchange tubes penetrate the middle partition. The top of one side of the middle partition is connected to a heat collection tube, and the top of the other side is connected to a heat conduction tube. A water inlet pipe is provided at the bottom of the outer shell, and a steam outlet is provided at the top of the outer shell. The steam outlet is connected to a steam buffer tank through a collecting pipe. Both the heat collection tubes and the outer wall of the outer shell are provided with insulation layers.

[0007] Furthermore, the lifting module includes an upper connecting plate, a lower connecting plate, and a side plate installed between the upper connecting plate and the lower connecting plate. The lower connecting plate is fixedly installed on the supporting top plate. An adjusting screw is rotatably installed between the upper connecting plate and the lower connecting plate. A drive motor that is pulsatorically connected to the adjusting screw is installed above the upper connecting plate. Guide rods are arranged parallel to both sides of the adjusting screw. A lifting slide is slidably installed on the adjusting screw and the guide rods. The connecting bracket is fixedly connected to the lifting slide.

[0008] Furthermore, the telescopic pipe includes an upper connecting section, a telescopic section, and a lower connecting section connected sequentially from top to bottom. The upper connecting section and the telescopic section, as well as the telescopic section and the lower connecting section, are connected and fixedly connected by flange assemblies. The lower connecting section is fixedly installed on the connecting bracket.

[0009] Compared with existing technologies, the advantages of this device are: First, it optimizes the installation structure of the heat collection hood. The heat collection hood is mounted on the lifting module via a telescopic tube and connecting bracket. The lifting module can move the heat collection hood up and down via the connecting bracket and telescopic tube. Moving the heat collection hood up and down adjusts the distance between the heat collection hood and the cooling bed body, thus adjusting the installation height of the heat collection hood, increasing the heat collection area, improving the heat collection capacity, enhancing the efficiency of heat recovery, and increasing the practicality of the device. Second, this system optimizes the structure of the waste heat recovery unit. Each heat collection unit... Each heat collection tube end of the heat shroud is individually equipped with a corresponding waste heat recovery unit. Each waste heat recovery unit can efficiently recover the waste heat collected by the heat collection tubes, thus solving the shortcomings of incomplete hot air collection and low waste heat recovery rate in multiple heat collection shrouds. This enables efficient recovery and utilization of thermal energy. Furthermore, the heat energy processed by the heat recovery unit needs to be cooled again by a recooler. This not only further improves the heat energy recovery and utilization rate, achieving efficient heat energy recovery, but also further reduces the temperature of the circulating hot air, ensuring the cooling effect of the circulating hot air during the cooling process. This device has the advantages of reasonable structural design, strong practicality, and high heat energy recovery and utilization rate, making it easy to promote and use. Attached Figure Description

[0010] Figure 1 This is a front view schematic diagram of the present invention; Figure 2 This is a side view schematic diagram of the present invention; Figure 3 This is a front view of the connection between the telescopic tube 7 and the heat collection cover 8 in this invention; Figure 4 This is a top view of the connection between the telescopic tube 7 and the heat collection cover 8 in this invention; Figure 5 A schematic diagram of the waste heat recovery unit 9 in this invention; Figure 6 This is a schematic diagram of the lifting module 5 in this invention; In the diagram: 1-Cooling bed body, 2-Cooling air cooling device, 3-Supporting frame, 4-Supporting top plate, 5-Lifting module, 51-Upper connecting plate, 52-Lower connecting plate, 53-Side plate, 54-Adjusting screw, 55-Drive motor, 56-Lifting slide, 57-Guide rod, 6-Connecting bracket, 7-Telescopic tube, 8-Heat collector cover, 81-Fixed cover, 82-First movable cover, 83-Second movable cover, 84-First positioning seat, 85-Second positioning seat, 86-Positioning rod 87-Positioning block, 88-Spring, 89-Cylinder, 810-Clamping slider, 811-Supporting plate, 812-Limiting block, 9-Waste heat recovery unit, 91-Outer shell, 92-Inner shell, 93-Intermediate partition, 94-Baffle plate, 95-Heat exchange tube assembly, 96-Water inlet pipe, 97-Steam outlet, 98-Gathering pipe, 99-Steam buffer tank, 910-Insulation layer, 10-Heat collector tube, 11-Heat conduction tube, 12-Recooler, 13-Exhaust fan, 14-Circulation pipe. Detailed Implementation

[0011] The present invention will be further described below with reference to the embodiments and accompanying drawings, but this does not limit the present invention in any way. Any changes or substitutions made based on the teachings of the present invention are within the protection scope of the present invention.

[0012] The waste heat recovery system for a steel bar cooling bed of the present invention includes a cooling bed body 1, which is a structure used in the prior art and is mainly used for conveying and cooling the bars. A waste heat recovery device is provided on one side of the high-temperature zone of the cooling bed body 1, and a cold air cooling device 2 is provided on one side of the low-temperature zone of the cooling bed body 1. The cold air cooling device 2 is a structure with the same function as that used in the prior art, mainly including a cold air blower and air distribution ducts. The cold air blower cools the high-temperature zone, and the heat generated by the air cooling is blown towards the high-temperature zone. The heat energy accumulated in the high-temperature zone will enter the waste heat recovery device. The waste heat recovery device includes a support frame 3 and a support top plate 4. The support frame 3 is erected above the cooling bed body 1 and is a structure used in the prior art, mainly including support frames on both sides and a top bracket installed on the top of the two support frames. The support top plate 4 is installed above the support frame 3 and is arranged perpendicular to the moving direction of the bars conveyed by the cooling bed body 1. Multiple lifting modules 5 are installed at equal intervals on the top plate 4. The lifting modules 5 can drive the connecting brackets 6 to move up and down. Each lifting module 5 is equipped with a connecting bracket 6. The connecting bracket 6 is equipped with a telescopic pipe 7. The lower end of the telescopic pipe 7 is equipped with a heat collection cover 8. The telescopic pipe 7 can extend and retract up and down. The upper end of the telescopic pipe 7 is connected to a waste heat recovery device 9 through a heat collection pipe 10. The waste heat recovery device 9 is installed on the supporting top plate 4. The waste heat recovery device 9 is connected to a circulation pipe 14 through a heat conduction pipe 11. An induced draft fan 13 is installed on the heat conduction pipe 11. A recooler 12 is installed on the circulation pipe 14. The circulation pipe 14 is connected to a cold air cooling device 2. The recooler 12 used in this invention is a technology used in the prior art. It can adopt a tube-type structure. The recooler can preheat the gas or air used in the heating furnace. The heating furnace is a heating device used for hot rolling of bars. Preheating the gas or air before it enters the heating furnace can improve the combustion efficiency.

[0013] The working process of this system is as follows: When the hot-rolled bar enters the cooling bed body 1, as it moves from the high-temperature zone to the low-temperature zone on the cooling bed body 1, the cold air cooling device 2 blows cold air from the low-temperature zone to the high-temperature zone to cool the bar. As the blown cold air moves from the low-temperature zone to the high-temperature zone, it continuously absorbs the heat from the bar. When the cold air reaches the high-temperature zone, its temperature rises, forming hot air at a higher temperature. At this time, the hot air enters the heat collection hood 8 under the action of the induced draft fan 13, and then passes through the telescopic pipe 7. The hot air enters the heat collection pipe 10 and then the waste heat recovery unit 9. The waste heat recovery unit 9 can recover the heat energy carried by the hot air. After the heat energy is recovered, the temperature of the hot air decreases, and then it enters the circulation pipe 14 through the heat conduction pipe 11. After absorbing heat energy again through the re-cooler 12 installed on the circulation pipe 14, the hot air is transformed into cold air again and returns to the cold air cooling device 2 for recycling. In this system, during the process of collecting hot air, the heat collection hood 8 can use the lifting module 5 to drive the connecting bracket 6 to move up and down. During the up-and-down movement of the connecting bracket 6, the length of the telescopic tube 7 will extend or retract, thereby enabling the up-and-down movement of the heat collection hood 8. The up-and-down movement of the heat collection hood 8 allows for adjustable spacing between the heat collection hood 8 and the cooling bed body 1. By adjusting the height between the heat collection hood 8 and the cooling bed body 1, hot air can be collected efficiently, thereby improving the heat energy recovery and utilization rate and enhancing the practicality of the device. At the same time, this system optimizes the structure of the waste heat recovery device. Each heat collection tube 10 end of each heat collection hood 8 is individually equipped with a corresponding waste heat recovery device 9. Each waste heat recovery device 9 can efficiently recover the waste heat collected by the heat collection tube 10. This can solve the shortcomings of incomplete hot air collection and low waste heat recovery rate of multiple heat collection hoods 8, and achieve efficient heat energy recovery and utilization. The heat energy processed by the heat recovery device 9 needs to be cooled down again by the recooler 12. This not only further improves the heat energy recovery and utilization rate and achieves efficient heat energy recovery, but also reduces the temperature of the circulating hot air again, ensuring the cooling effect of the circulating hot air during the cooling process.

[0014] Furthermore, to improve the practicality of the heat collection cover 8 and increase the heat absorption range, the heat collection cover 8 includes a fixed cover body 81 and a first movable cover body 82 and a second movable cover body 83 movably installed at both ends of the fixed cover body 81. Two sets of telescopic adjustment components are symmetrically installed on both sides of the top between the first movable cover body 82 and the second movable cover body 83. These two sets of telescopic adjustment components can drive the first movable cover body 82 and the second movable cover body 83 to move relative to each other along both ends of the fixed cover body 81. By moving the first movable cover body 82 and the second movable cover body 83 away from each other and closer to each other, the size of the heat collection cover 8 itself can be adjusted, thereby increasing the heat absorption area of ​​the heat absorption cover and expanding the heat absorption range. Preferably, the telescopic adjustment components include a first positioning seat 84, a second positioning seat 85, a positioning rod 86, and a positioning block 87. The first positioning seat 84 is installed on the top of the first movable cover body 82, and the second positioning seat 85 is installed on the top of the second movable cover body 83 and is opposite to the first positioning seat 84. The second positioning seat 85 is machined with… The positioning rod 86 has a positioning hole. One end of the positioning rod 86 is fixedly set to the first positioning seat 84, and the other end of the positioning rod 86 passes through the positioning hole. A spring 88 is installed on the positioning rod between the first positioning seat 84 and the second positioning seat 85. The positioning block 87 is slidably installed on the positioning rod 86 on the side away from the spring 88. A pressing mechanism is installed on the top of the first movable cover 82, which slides in contact with the positioning block 85. The pressing mechanism drives the positioning block 87 to move and contact the first positioning seat 84. The spring 88 is fixed, and the first movable cover 82 and the second movable cover 83 stop moving. When the pressing mechanism drives the positioning block 87 to move and no longer contact the first positioning seat 84, the spring 88 extends, and the first movable cover 82 and the second movable cover 83 move along the fixed cover 81, increasing the heat absorption range. When the first movable cover 82 and the second movable cover 83 move to a suitable distance, the pressing mechanism drives the positioning block 87 to move and contact the first positioning seat 84 again, positioning the first movable cover 82 and the second movable cover 83 and stopping their movement. Preferably, the clamping mechanism includes a cylinder 89 and a clamping slider 810. A support plate 811 is installed on the top of the first movable cover 82. There are two cylinders 89. The cylinders are the structure used in the prior art, and finished products can be purchased directly according to the requirements of use. The cylinders 89 are located on both sides of the positioning rod 86. The clamping slider 810 is slidably installed on the positioning rod 86. The fixed end of the cylinder 89 is fixedly installed on the support plate 811. The movable end of the cylinder 89 is fixedly connected to the clamping slider 810. A limit block 812 is installed at the end of the positioning rod 86. When the movable end of the cylinder 89 extends or shortens, the cylinder 89 can drive the clamping slider 810 to move back and forth along the positioning rod 86. The movement of the clamping slider 810 will drive the positioning block 87 to move back and forth, controlling the extension or shortening of the spring 88, thereby allowing the first movable cover 82 and the second movable cover 83 to move, thereby realizing the adjustment of the heat absorption range of the heat collection cover 8.

[0015] Furthermore, the waste heat recovery unit 9 includes an outer shell 91 and an inner shell 92. The inner shell 92 is spaced inside the outer shell 91. The top of the inner shell 92 is sealed to the top of the outer shell 91, and the bottom of the inner shell 92 is sealed to the bottom of the outer shell 91. A middle partition 93 is vertically arranged inside the inner shell 92. The top of the middle partition 93 is sealed to the top of the inner shell 92, and a gap is left between the bottom of the middle partition 93 and the bottom of the inner shell 92. The cavity between the inner shell 92 and the outer shell 91 is a heat exchange chamber. Multiple baffles 94 are installed alternately inside the heat exchange chamber. Multiple rows of baffles 94 are arranged on the inner shell 92 on both the upper and lower sides of each baffle 94. The heat exchange tube group 95 communicates with the heat exchange chamber. Each row of heat exchange tube group 95 has multiple heat exchange tubes, which are evenly distributed within the inner shell 92. The heat exchange tubes can adopt the structure of straight tubes or finned tubes used in the prior art. The heat exchange tube group 95 passes through the intermediate partition 93. The top of one side of the intermediate partition 93 is connected to the heat collection tube 10, and the top of the other side of the intermediate partition 93 is connected to the heat conduction tube 11. The bottom of the outer shell 91 is provided with a water inlet pipe 96, and the top of the outer shell 91 is provided with a steam outlet 97. The steam outlet 97 is connected to a steam buffer tank 99 through a collecting pipe 98. The working principle of the waste heat recovery unit 9 is as follows: the hot air absorbed by the heat collection hood 8 enters the inner shell 92 through the telescopic pipe 7 and the heat collection tube 10. When the hot air is inside the shell 92, cold water is supplied to the outer shell 91 through the water inlet pipe 96. After entering the heat exchange chamber, the cold water enters the heat exchange tube assembly 95. Due to the action of the baffle 64, the cold water flows in a curved pattern through the heat exchange tube assembly 95 within the inner shell 92. When the hot air enters the inner shell 92, due to the separation effect of the intermediate partition 93, the hot air moves from bottom to top within the inner shell 92 on one side of the intermediate partition 93. When it reaches below the intermediate partition 93, it enters the inner shell 92 on the other side from below the intermediate partition 93. The hot air moves from bottom to top and then from bottom to top within the inner shell 92, which prolongs the hot air flow time and extends the contact time with the heat exchange tube assembly 95, improving the contact between the hot air and the heat exchange tube assembly 95. The contact time between cold water and the heat exchanger tubes 95 is increased to improve the heat recovery effect. As the cold water flows within the heat exchanger tube assembly 95, it continuously absorbs heat energy from the hot air. After absorbing heat energy, the cold water temperature rises and forms steam. The steam then enters the collecting pipe 98 through the steam outlet 97, and then into the steam buffer tank 99. The steam in the steam buffer tank 99 can be used for power generation. Preferably, to prevent heat loss, both the heat collection tubes 10 and the outer wall of the outer shell 91 are provided with an insulation layer 910. The insulation layer 910 can be made of rock wool, as used in existing technologies. The rock wool isolates the heat inside the outer shell from the external working environment, improving the safety of operators during operation. During the use of the waste heat recovery unit 9...Temperature sensors can be installed on the heat collection pipe 10 and the heat conduction pipe 11 to detect the temperature of the hot air. Operators can then use these sensors to monitor the actual operating conditions in real time, thereby improving the stability of the system.

[0016] Furthermore, the lifting module 5 can drive the connecting bracket 6 to rise or fall. Preferably, the lifting module 5 includes an upper connecting plate 51, a lower connecting plate 52, and a side plate 53 installed between the upper connecting plate 51 and the lower connecting plate 52. The lower connecting plate 51 is fixedly installed on the supporting top plate 5. An adjusting screw 54 is rotatably installed between the upper connecting plate 51 and the lower connecting plate 52. A drive motor 55, which is pulsatorically connected to the adjusting screw 54, is installed above the upper connecting plate 51. The drive motor 55 is a structure used in the prior art. The adjusting screw 54... Guide rods 57 are arranged parallel to each other on both sides. A lifting slide 56 is slidably installed on the adjusting screw 54 and the guide rods 57. The connecting bracket 6 is fixedly connected to the lifting slide 56. In use, the drive motor 44 drives the adjusting screw 54 to rotate forward or backward, which can drive the lifting slide 56 to move upward or downward along the adjusting screw 54 and the guide rods 57, thereby realizing the raising or lowering of the connecting bracket 6. The guide rods 6 have a guiding function, which can ensure that the lifting slide 56 always maintains a linear movement state during the upward or downward movement.

[0017] Furthermore, the telescopic tube 7 includes an upper connecting section, a telescopic section, and a lower connecting section connected sequentially from top to bottom. The telescopic section is a metal telescopic tube mechanism used in the prior art. In order to facilitate the replacement of the telescopic section, the upper connecting section and the telescopic section, and the telescopic section and the lower connecting section are connected and fixed by flange assemblies. The lower connecting section is fixedly installed on the connecting bracket 6.

Claims

1. A high-efficiency waste heat recovery system for a cooling bed of rolled steel bars, comprising a cooling bed body (1), a waste heat recovery device provided on one side of the high-temperature zone of the cooling bed body (1), and a cold air cooling device (2) provided on one side of the low-temperature zone of the cooling bed body (1), characterized in that: The waste heat recovery device includes a support frame (3) and a support top plate (4). The support frame (3) is mounted above the cooling bed body (1), and the support top plate (4) is mounted above the support frame (3). The support top plate (4) is arranged perpendicular to the moving direction of the cooling bed body (1) for transferring the bar stock. Multiple sets of lifting modules (5) are installed at equal intervals on the support top plate (4). Each set of lifting modules (5) is equipped with a connecting bracket (6), and a telescopic pipe is installed on the connecting bracket (6). 7) A heat collection cover (8) is installed at the lower end of the telescopic pipe (7). A waste heat recovery device (9) is connected to the upper end of the telescopic pipe (7) through a heat collection pipe (10). The waste heat recovery device (9) is installed on the supporting top plate (4). The waste heat recovery device (9) is connected to a circulation pipe (14) through a heat conduction pipe (11). An induced draft fan (13) is installed on the heat conduction pipe (11). A recooler (12) is installed on the circulation pipe (14). The circulation pipe (14) is connected to the cold air cooling device (2).

2. The waste heat recovery system for a steel bar cooling bed according to claim 1, characterized in that: The heat collection cover (8) includes a fixed cover (81) and a first movable cover (82) and a second movable cover (83) movably installed at both ends of the fixed cover (81). Two sets of telescopic adjustment components are symmetrically installed on the top sides between the first movable cover (82) and the second movable cover (83).

3. The waste heat recovery system for a steel bar cooling bed according to claim 2, characterized in that: The telescopic adjustment assembly includes a first positioning seat (84), a second positioning seat (85), a positioning rod (86), and a positioning block (87). The first positioning seat (84) is installed on the top of the first movable cover (82), and the second positioning seat (85) is installed on the top of the second movable cover (83) and is opposite to the first positioning seat (84). The second positioning seat (85) has a positioning hole. One end of the positioning rod (86) is fixedly installed with the first positioning seat (84), and the other end of the positioning rod (86) passes through the positioning hole. A spring (88) is installed on the positioning rod between the first positioning seat (84) and the second positioning seat (85). The positioning block (87) is slidably installed on the positioning rod (86) on the side away from the spring (88). The top of the first movable cover (82) is equipped with a clamping mechanism that slides in contact with the positioning block (85).

4. The waste heat recovery system for a steel bar cooling bed according to claim 3, characterized in that: The clamping mechanism includes a cylinder (89) and a clamping slider (810). A support plate (811) is installed on the top of the first movable cover (82). There are two cylinders (89), which are located on both sides of the positioning rod (86). The clamping slider (810) is slidably installed on the positioning rod (86). The fixed end of the cylinder (89) is fixedly installed on the support plate (811). The movable end of the cylinder (89) is fixedly connected to the clamping slider (810). A limit block (812) is installed at the end of the positioning rod (86).

5. The waste heat recovery system for a steel bar cooling bed according to claim 1, characterized in that: The waste heat recovery unit 9 includes an outer shell (91) and an inner shell (92). The inner shell (92) is installed inside the outer shell (91) at a distance. The top of the inner shell (92) is sealed to the top of the outer shell (91), and the bottom of the inner shell (92) is sealed to the bottom of the outer shell (91). A middle partition plate (93) is vertically arranged inside the inner shell (92). The top of the middle partition plate (93) is sealed to the top of the inner shell (92), and a gap is left between the bottom of the middle partition plate (93) and the bottom of the inner shell (92). The cavity between the inner shell (92) and the outer shell (91) is a heat exchange chamber. The heat exchange cavity is equipped with multiple baffles (94) arranged vertically inside. On the inner shell (92) on both sides of each baffle (94), there are multiple rows of heat exchange tube groups (95) communicating with the heat exchange cavity. The heat exchange tube groups (95) pass through the middle partition (93). The top of one side of the middle partition (93) is connected to the heat collection tube (10), and the top of the other side of the middle partition (93) is connected to the heat conduction tube (11). The bottom of the outer shell (91) is provided with a water inlet pipe (96), and the top of the outer shell (91) is provided with a steam outlet (97). The steam outlet (97) is connected to a steam buffer tank (99) through a collecting pipe (98).

6. The waste heat recovery system for a steel bar cooling bed according to claim 5, characterized in that: Both the heat collection tube (10) and the outer wall of the outer shell (91) are provided with a heat insulation layer (910).

7. The waste heat recovery system for a steel bar cooling bed according to claim 1, characterized in that: The lifting module (5) includes an upper connecting plate (51), a lower connecting plate (52), and a side plate (53) installed between the upper connecting plate (51) and the lower connecting plate (52). The lower connecting plate (51) is fixedly installed on the supporting top plate (5). An adjusting screw (54) is rotatably installed between the upper connecting plate (51) and the lower connecting plate (52). A drive motor (55) connected to the adjusting screw (54) is installed above the upper connecting plate (51). Guide rods (57) are arranged parallel to each other on both sides of the adjusting screw (54). A lifting slide (56) is slidably installed on the adjusting screw (54) and the guide rods (57). The connecting bracket (6) is fixedly connected to the lifting slide (56).

8. The waste heat recovery system for a steel bar cooling bed according to claim 1, characterized in that: The telescopic pipe (7) includes an upper connecting section, a telescopic section and a lower connecting section connected sequentially from top to bottom. The upper connecting section and the telescopic section, and the telescopic section and the lower connecting section are connected and fixed by flange assemblies. The lower connecting section is fixedly installed on the connecting bracket (6).

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