A continuous variable load type cold hearth billet sensible heat recovery device

Abstract

A stepless variable load cooling bed billet sensible heat recovery device is disclosed. This invention addresses the problems of intermittent and unstable heat sources in existing cooling bed rolling mills; frequent plant maintenance requirements; excessive air cooling heat dissipation leading to reduced billet quality; and potential disruption to normal rolling processes. The invention features at least one set of billet sensible heat recovery units arranged parallel to each other along the billet's movement direction at the upper end of the cooling bed. A support system is vertically mounted on concrete, with one side of the upper end of the support system pivotally connected to the end of a horizontally arranged hoisting system. A heat exchanger system is hoisted to the lower end of the other side of the support system, recovering heat from the billet that would otherwise dissipate into the atmosphere. The lower end of a hydraulic system is mounted on the support base plate of the support system, and the upper end of the hydraulic system is connected to the hoisting support cantilever of the hoisting system. This invention is used for sensible heat recovery of billets on a cooling bed.

Description

Technical Field

[0001] This invention relates to a sensible heat recovery device for steel billets, specifically a stepless variable load cooling bed sensible heat recovery device for steel billets. It belongs to the field of energy-saving and environmental protection equipment. Background Technology

[0002] As is well known, the steel industry is a resource- and energy-intensive industry, characterized by high production costs and energy consumption. However, in recent years, the annual decline in energy consumption per ton of steel by key domestic enterprises has gradually slowed down, indicating that the current energy-saving and consumption-reducing technologies in the steel industry have reached a bottleneck and urgently need technological innovation.

[0003] The cooling bed is a crucial piece of equipment in the cold rolling process, its function being to slowly cool the high-temperature rolled steel to the temperature required for subsequent processing or storage. However, currently, most steel companies in China do not utilize this heat, instead allowing it to dissipate into the factory air, resulting in energy waste and a deterioration of the working environment. Therefore, designing a targeted energy recovery system for cooling bed rolling is of great significance. The following technical challenges exist in designing such a system: 1. Intermittent and unstable heat source; 2. Frequent maintenance requirements within the factory area; 3. Excessive heat dissipation from air cooling leading to a reduction in billet quality; 4. Potential disruption to the normal rolling production process.

[0004] In summary, existing steel enterprises face several challenges if they wish to utilize the energy of cold-bed rolling mills: intermittent and unstable heat sources; frequent plant maintenance requirements; excessive heat dissipation from air cooling leading to reduced billet quality; and potential disruption to normal rolling mill production processes. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in steel enterprises when utilizing the energy of cooling bed rolling mills, such as intermittent and unstable heat sources, frequent plant maintenance requirements, excessive air cooling heat dissipation leading to reduced billet quality, and potential disruption to normal rolling production processes. Therefore, this invention provides a stepless variable load cooling bed billet sensible heat recovery device.

[0006] The technical solution of the present invention is as follows: A stepless variable load cooling bed billet sensible heat recovery device includes at least one set of billet sensible heat recovery units. The billet is installed on the cooling bed, and at least one set of billet sensible heat recovery units are arranged in parallel along the movement direction of the billet at the upper end of the cooling bed. Each set of billet sensible heat recovery units includes a support system, a hydraulic system, a hoisting system, and a heat exchanger system. The support system is vertically installed on concrete. One side of the upper end of the support system is pivotally connected to the end of the horizontally arranged hoisting system. The lower end of the other side of the upper end of the support system is hoisted with a heat exchanger system. The heat exchanger system recovers the heat of the billet that would otherwise be dissipated into the atmosphere. The lower end of the hydraulic system is installed on the support base plate of the support system, and the upper end of the hydraulic system is connected to the hoisting support cantilever of the hoisting system.

[0007] Furthermore, the support system includes a support base plate, a support base plate pivot base, multiple anchor bolts, two support ribs, a support system, a support top plate, a support top plate pivot base, and a support and hoisting system main shaft. The support base plate is horizontally arranged and installed on the concrete by multiple anchor bolts. The support base plate pivot base is installed on the support base plate. The two support ribs are vertically parallel and installed on the support base plate, and the two support ribs are connected by the support system. The support top plate is fixedly installed on the upper surface of the two support ribs and the support system. The support top plate pivot base is installed on the upper surface of the support top plate. The support and hoisting system main shaft passes through the support top plate pivot base and the hoisting support cantilever of the hoisting system.

[0008] Furthermore, the hydraulic system includes a hydraulic pump, a support and hydraulic system spindle, a hydraulic cylinder base, a hydraulic cylinder body, a hydraulic piston rod, a hydraulic cylinder piston rod top seat, and a hydraulic and hoisting system spindle. The hydraulic pump and hydraulic cylinder base are mounted on the support base plate. The lower end of the hydraulic cylinder body is rotatably mounted on the hydraulic cylinder base via the support and hydraulic system spindle. The lower part of the hydraulic piston rod is mounted inside the hydraulic cylinder body. The hydraulic cylinder piston rod top seat is mounted on the lower end of the hoisting support cantilever of the hoisting system via the hydraulic and hoisting system spindle. The upper part of the hydraulic piston rod is connected to the hydraulic cylinder piston rod top seat.

[0009] Furthermore, the hoisting system includes a hoisting support cantilever, two hoisting normal beams, a hoisting tangential beam, hoisting main body fasteners, a hoisting main body fixing plate, and multiple hoisting heat exchange connecting plates. One end of the hoisting support cantilever is connected to the main shaft of the hoisting system and the rotating shaft base of the support top plate through a support. The two hoisting normal beams are arranged in parallel and connected to each other through the hoisting tangential beam. The other end of the hoisting support cantilever is connected to one of the hoisting normal beams through the hoisting main body fasteners. Multiple hoisting heat exchange connecting plates are installed on the lower end faces of the two hoisting normal beams and connected to the heat exchanger heat exchange system.

[0010] Furthermore, the heat exchanger system includes a heat exchanger, a header heat exchanger connecting pipe, a header inlet flange, and a header outlet flange. The inlet side of the heat exchanger is connected to the header inlet flange via the header heat exchanger connecting pipe, and the inlet of the header inlet flange is connected to the header. The outlet side of the heat exchanger is connected to the header outlet flange via the header heat exchanger connecting pipe, and the outlet of the header outlet flange is connected to the header. Temperature and pressure measuring devices are arranged on the outlet-connected header to monitor the working fluid status inside the header in real time.

[0011] Preferably, the heat exchanger is a bare tube heat exchanger, a membrane wall heat exchanger, or a finned tube heat exchanger.

[0012] Preferably, the heat exchanger is a vacuum tube heat exchanger in the far-infrared wavelength range.

[0013] Furthermore, the heat exchanger system also includes a main heat exchanger insulation plate, which is installed on the heat exchanger.

[0014] Furthermore, the heat exchanger system also includes a reflector wall shaft, a reflector wall lug, a heat exchanger lug, and two reflectors. The heat exchanger lug is welded to the lower side of the heat exchanger and is connected to the reflector wall lug via the reflector wall shaft. The reflector wall lug is welded to the two reflectors.

[0015] Furthermore, the heat exchanger system also includes two reflector wall side insulation plates, with one reflector wall side insulation plate installed on each reflector wall.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The technical means adopted by this invention to solve the problem of "intermittent and unstable heat source" is as follows: temperature and pressure measuring devices are arranged on the outlet 412 connecting header to monitor the working fluid state inside the header in real time. Theoretical calculations and operational tests determine the working fluid state range during stable system operation. Logic control is added to drive the hydraulic pump to move the heat exchanger closer to or further away from the steel billet to ensure that the working fluid is always in a stable state range.

[0018] 2. The technical means adopted by the present invention to solve the problem of "frequent maintenance requirements in the factory area" is as follows: during maintenance, the hydraulic pump is turned on to support the entire heat exchanger system vertically to the ground, so as not to affect the workers' maintenance and to minimize the operation of the crane in the factory.

[0019] 3. The technical means adopted by the present invention to solve the problem of "excessive heat dissipation intensity of air cooling reduces the quality of steel billet" is as follows: The design principle of the present invention is based on radiative heat conduction. The convection intensity between the air inside the equipment and the steel billet is basically the same as the convection intensity of the steel billet under natural heat dissipation. The principle of "forced air heat exchange" is not adopted, so the quality of steel billet will not be reduced.

[0020] 4. The technical means adopted by the present invention to solve the problem of "potentially affecting the normal production process of steel rolling" is as follows: The present invention achieves equipment minimization, occupying only one side of the cooling bed; the present invention does not change the steel rolling cooling process, and if the equipment malfunctions, the rotatable heat exchange structure can be quickly uprighted and switched to the conventional billet heat dissipation mode, minimizing the impact. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a structural diagram of support system 1, hydraulic system 2, and hoisting system 3; Figure 3 This is a schematic diagram of the heat exchanger system. Detailed Implementation

[0022] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a stepless variable load cooling bed billet sensible heat recovery device, which includes at least one billet sensible heat recovery unit. The billet 6 is installed on the cooling bed 5, and at least one billet sensible heat recovery unit is arranged in parallel along the billet movement direction at the upper end of the cooling bed 5. Each billet sensible heat recovery unit includes a support system 1, a hydraulic system 2, a hoisting system 3, and a heat exchanger system 4. The support system 1 is vertically installed on concrete, and one side of the upper end of the support system 1 is pivotally connected to the end of the horizontally arranged hoisting system 3. The heat exchanger system 4 is hoisted at the lower end of the other side of the upper end of the support system 1. The heat exchanger system 4 recovers the heat of the billet that would otherwise be dissipated into the atmosphere. The lower end of the hydraulic system 2 is installed on the support base plate 11 of the support system 1, and the upper end of the hydraulic system 2 is connected to the hoisting support cantilever 31 of the hoisting system 3.

[0023] In this embodiment, one or more sets of billet sensible heat recovery devices are arranged in parallel along the billet movement direction at the upper end of the cooling bed to recover the heat of the billet that would otherwise be dissipated into the atmosphere, so that the rated heat recovery power is almost the same as the natural heat dissipation power of the billet, and can be adaptively adjusted steplessly according to the billet output.

[0024] The heat exchange medium of the present invention needs to be connected to the heat exchange system through a hose and then flow out from the hose, which facilitates the rotation process of the heat exchanger heat recovery system 4.

[0025] This invention solves the problem of intermittent and unstable heat source in steel rolling by stepless variable load; it frees up maintenance space above the cooling bed through hydraulic support and hoisting, which can meet the requirements of frequent maintenance in the plant area; it does not use forced air, but only radiation and natural convection to recover heat, avoiding rapid airflow that intensifies oxidation on the surface of the billet and affects the quality of the billet; the device is a single unit, fixed only by anchor bolts, and can be quickly disassembled by unbolting and lifting with a crane; the device is laid in the space above and to the side of the cooling bed, without affecting the steel rolling production process.

[0026] According to relevant survey data, China's crude steel output is 1.033 billion tons. Based on preliminary estimates of domestic steel production, the market potential for waste heat recovery from rolling mill cooling beds exceeds 2 billion yuan, and could potentially reach 20 billion yuan. This invention can be applied not only to the steel industry, but also to other processes requiring natural heat dissipation cooling via chain conveyors, offering significant economic and technical benefits.

[0027] This patent introduces several innovative features, including stepless variable load, low-density reflective wall, hydraulic support for rapid maintenance, and overall disassembly.

[0028] Specific Implementation Method Two: Combining Figure 1 and Figure 2This embodiment describes a support system 1 comprising a support base plate 11, a support base plate pivot base 12, multiple anchor bolts 13, two support ribs 14, a support system 15, a support top plate 16, a support top plate pivot base 17, and a support and hoisting system main shaft 18. The support base plate 11 is horizontally arranged and mounted on concrete using multiple anchor bolts 13. The support base plate pivot base 12 is mounted on the support base plate 11. The two support ribs 14 are vertically and parallelly mounted on the support base plate 11 and connected to each other via the support system 15. The support top plate 16 is fixedly mounted on the upper surfaces of the two support ribs 14 and the support system 15. The support top plate pivot base 17 is mounted on the upper surface of the support top plate 16. The support and hoisting system main shaft 18 passes through the support top plate pivot base 17 and the hoisting support cantilever 31 of the hoisting system 3.

[0029] This configuration facilitates support for the heat exchanger system. Other components and connections are the same as in Specific Implementation Method 1.

[0030] Specific implementation method three: Combining Figure 1 and Figure 2 This embodiment describes a hydraulic system 2 comprising a hydraulic pump 21, a support and hydraulic system spindle 22, a hydraulic cylinder base 23, a hydraulic cylinder body 24, a hydraulic piston rod 25, a hydraulic cylinder piston rod top seat 26, and a hydraulic and hoisting system spindle 27. The hydraulic pump 21 and the hydraulic cylinder base 23 are mounted on the support base plate 11. The lower end of the hydraulic cylinder body 24 is rotatably mounted on the hydraulic cylinder base 23 via the support and hydraulic system spindle 22. The lower part of the hydraulic piston rod 25 is mounted inside the hydraulic cylinder body 24. The hydraulic cylinder piston rod top seat 26 is mounted on the lower end of the hoisting support cantilever 31 of the hoisting system 3 via the hydraulic and hoisting system spindle 27. The upper part of the hydraulic piston rod 25 is connected to the hydraulic cylinder piston rod top seat 26.

[0031] With this configuration, this embodiment can use the control program of the hydraulic system 2 to push the hydraulic piston rod 25 to drive the hoisting system 3 and the heat exchanger heat recovery system 4 to rotate around the support and the main shaft 18 of the hoisting system, thereby controlling the distance between the heat exchanger and the hot steel billet and achieving a stepless variable load effect. The heat absorption can be controlled at any value between zero load and maximum load.

[0032] In addition, the hydraulic piston rod 25 can be quickly pushed by the control program of the hydraulic system 2 to drive the hoisting system 3 and the heat exchanger heat recovery system 4 to rotate around the support and hoisting system main shaft 18, so that the cooling bed and the hot steel billet are fully exposed to the air, meeting the plant's needs for rapid maintenance.

[0033] Other components and connections are the same as in specific implementation method one or two.

[0034] This implementation is spatially positioned between the heat exchanger heat recovery system 4 and the support system 1, using the hoisting system 3 as a lever to realize a spatial lever structure of heat exchanger heat recovery system 4 - hydraulic system 2 - support system 1, with the fulcrum being the hydraulic and hoisting system main shaft 27 in the hydraulic system 2.

[0035] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment describes the hoisting system 3, which includes a hoisting support cantilever 31, two hoisting normal beams 32, a hoisting tangential beam 33, a hoisting main body fastener 34, a hoisting main body fixing plate 35, and multiple hoisting heat exchange connecting plates 36. One end of the hoisting support cantilever 31 is connected to the main shaft 18 of the hoisting system and the rotating shaft base 17 of the support top plate via a support. The two hoisting normal beams 32 are arranged in parallel and connected to each other via the hoisting tangential beam 33. The other end of the hoisting support cantilever 31 is connected to one of the hoisting normal beams 32 via the hoisting main body fastener 34. Multiple hoisting heat exchange connecting plates 36 are installed on the lower end faces of the two hoisting normal beams 32 and connected to the heat exchanger system 4.

[0036] This configuration facilitates the hoisting of the heat exchanger system. Other components and connections are the same as in specific implementation methods one, two, or three.

[0037] Specific Implementation Method Five: Combining Figure 1 and Figure 3 This embodiment describes a heat exchanger system 4 comprising a heat exchanger 41, a header heat exchanger connecting pipe 48, a header inlet flange 49, and a header outlet flange 412. The inlet side of the heat exchanger 41 is connected to the header inlet flange 49 via the header heat exchanger connecting pipe 48. The inlet 410 of the header inlet flange 49 is connected to the header. The outlet side of the heat exchanger 41 is connected to the header outlet flange 412 via the header heat exchanger connecting pipe 48. The outlet 411 of the header outlet flange 412 is connected to the header. Temperature and pressure measuring devices are arranged on the header connected to the outlet 412 to monitor the working fluid status inside the header in real time.

[0038] With this configuration, the core component of the present invention is the heat exchanger heat recovery system 4. The heat exchange working fluid is fed into the inlet 410 connecting header through the header inlet flange 49, enters the heat exchanger 41 through the header heat exchanger connecting pipe 48, and fully absorbs the radiant heat released by the hot steel billet and the convective heat conducted by the high-temperature air to become a high-temperature working fluid. It is then led out through the header heat exchanger connecting pipe 48, the connecting header on the outlet 411 side, and the header outlet flange 412. The high-temperature working fluid can continue to enter the heat recovery device to improve parameters, or it can be directly stored or utilized. Other components and connections are the same as in specific embodiments one, two, three, or four.

[0039] In this embodiment, the heat exchanger 41 is coated with a high emissivity (ε>0.95) material near the steel billet 6, which absorbs almost all the heat radiated to the heat exchanger 41, effectively enhancing the heat exchange efficiency between the working fluid and the steel billet.

[0040] Specific Implementation Method Six: Combination Figure 1 and Figure 3 This embodiment describes a heat exchanger 41 that is a bare tube heat exchanger, a membrane wall heat exchanger, or a finned tube heat exchanger. This configuration provides good versatility for the heat exchanger. Other components and connections are the same as in specific embodiments one, two, three, four, or five.

[0041] Specific implementation method seven: Combination Figure 1 and Figure 3 This embodiment describes a vacuum tube heat exchanger 41 in the far-infrared wavelength range. This configuration results in good heat exchange performance. Other components and connections are the same as in specific embodiments one, two, three, four, five, or six.

[0042] Specific implementation method eight: Combination Figure 1 and Figure 3 This embodiment further includes a main heat exchanger insulation plate 45, which is mounted on the heat exchanger 41. This arrangement facilitates heat exchanger insulation and ensures efficient heat exchange. Other components and connections are the same as in specific embodiments one, two, three, four, five, six, or seven.

[0043] Specific Implementation Method Nine: Combining Figure 1 and Figure 3 In this embodiment, the heat exchanger system 4 further includes a reflector wall shaft 42, a reflector wall lug 44, a heat exchanger lug 43, and two reflector walls 47. The heat exchanger lug 43 is welded to the lower side of the heat exchanger 41. The heat exchanger lug 43 is connected to the reflector wall lug 44 through the reflector wall shaft 42. The reflector wall lug 44 is welded to the two reflector walls 47.

[0044] With this configuration, the present invention arranges a reflective surface 47 on the side of the billet 6 within the space between the heat exchanger 41 and the cooling bed 5, so that the heat exchanger 41, the reflective surface 47 and the cooling bed 5 form a nearly enclosed space that surrounds the billet 6, thereby maximizing the heat recovery of the working fluid.

[0045] Other components and connections are the same as any one of the specific embodiments one to eight.

[0046] In this embodiment, the reflective surface on the reflective wall 47 is based on a high-temperature resistant material (>900℃). A high-reflectivity (emissivity ε<0.15) material is attached to the side near the steel billet 6 to reflect the heat radiated to the reflective surface and enhance the heat recovery effect of the working fluid.

[0047] Specific Implementation Method Ten: Combining Figure 1 and Figure 3 In this embodiment, the heat exchanger system 4 further includes two reflector wall side insulation plates 46, with one reflector wall side insulation plate 46 installed on each reflector wall 47. This arrangement facilitates heat insulation of the reflector walls. Other components and connections are the same as in any of the specific embodiments one to nine.

[0048] Combination Figures 1 to 3 Explanation of the working principle of this invention:

[0049] The stepless variable load cooling bed sensible heat recovery device for steel billets of the present invention, such as Figure 1 As shown, the entire system consists of four parts: a support system, a hydraulic system, a hoisting system, and a heat exchanger system.

[0050] The entire process is as follows: the steel is placed above the cooling bed and driven forward by the chain conveyor; along the direction of movement of the cooling bed chain conveyor, heat exchanger systems are arranged on the upper part and both sides of the steel. The entire heat exchanger system and the cooling bed chain conveyor form a long tunnel-like, semi-closed structure with openings only at the inlet and outlet ends; the heat exchanger is filled with a heat exchange medium to absorb the radiant and convective heat of the high-temperature steel. The generated high-temperature working medium can be used for power generation, heating, cooling, or other heat exchange structures to achieve energy recovery and reuse.

[0051] Heat exchanger heat exchange structure such as Figure 3 As shown, it consists of a heat exchanger, a reflector wall shaft, heat exchanger lead-out lifting lugs, reflector wall welded lifting lugs, heat exchanger main insulation, reflector wall side insulation, reflector wall, header heat exchanger connecting pipes, header inlet flange, inlet connecting header, outlet connecting header, and header outlet flange. The heat exchanger can be selected from commonly used forms in the energy and power field, such as bare tube arrays, membrane walls, and finned tube arrays, or vacuum heat collection tubes suitable for the far-infrared wavelength range. If a heat exchanger commonly used in boilers is selected, a high blackness coating ε>0.95 needs to be applied to the tube array near the steel rolling side to improve the heat exchange intensity of the heat exchanger.

[0052] To ensure stable operation of the working fluid within the heat exchanger, if water is used as the working fluid, a double-wound or triple-wound heat exchanger structure is recommended to avoid hydrodynamic problems caused by vaporization. The working fluid enters the header from the inlet flange. Since the heat exchanger employs a multi-channel flow arrangement, the header also has multiple outlets. The working fluid absorbs heat in the heat exchanger, increasing its enthalpy. After heat exchange, it flows out through the outlet header and the header outlet flange. It can be either connected via a flexible link to the next waste heat recovery system or drawn off for heat utilization.

[0053] The heat exchanger leads out lifting lugs are welded to the lower side of the heat exchanger and connected to the reflector wall lifting lugs via the reflector wall rotating shaft. The reflector wall lifting lugs are welded to the reflector wall. Since the reflector wall rotating shaft is only fixed in two directions of freedom, it can rotate on the main shaft along the direction of billet movement. Therefore, the reflector wall is equivalent to being suspended on the heat exchanger. Regardless of whether the heat exchanger rotates or not, the reflector wall is always perpendicular to the ground.

[0054] The function of the reflector wall is to reflect the radiant energy emitted by the high-temperature steel billet. The reflector wall is coated with a low-emissivity material near the inner side of the cooling bed to maximize its radiant energy reflection capability. As is well known, heat transfer occurs through three methods: conduction, convection, and radiation. Because the steel billet is surrounded in a closed region along the normal cross-section of its movement—cooling bed-reflector wall-heat exchanger-reflector wall-cooling bed—and the reflector wall, with its external insulation, can be considered approximately insulated, only the heat energy released by the billet through conduction carried away by the cooling bed is not recovered. All other forms of heat are carried away by the heat exchange medium in the low-temperature heat exchanger, resulting in high heat recovery efficiency.

[0055] The structure of the hoisting system is as follows Figure 2 The system comprises six parts: a lifting support cantilever, a lifting normal beam, a lifting tangential beam, lifting main body fasteners, a lifting main body fixing plate, and a lifting-heat exchanger connecting plate. The lifting normal beam and lifting tangential beam constitute the main lifting structure. The lifting-heat exchanger connecting plate is welded to the lifting normal beam, connecting the lifting system to the heat exchanger system. The lifting main body fasteners connect the lifting main structure and the lifting support cantilever. The lifting support cantilever provides a fulcrum for the support structure and inserts a support at its end, which, along with the main shaft of the lifting system, serves as the axis of rotation for the heat exchanger system.

[0056] The hydraulic system provides power to the entire waste heat recovery system of the rolling mill cooling bed, and its structure is as follows: Figure 2 It consists of a hydraulic pump, a support and hydraulic system spindle, a hydraulic cylinder base, a hydraulic cylinder body, a hydraulic piston rod, a hydraulic cylinder piston rod top seat, and the hydraulic and hoisting system spindle. The hydraulic pump provides power to the hydraulic system, driving the hydraulic piston rod to rise or fall. A top seat is welded to the top of the hydraulic piston rod and connected to the hoisting system via a shaft. The hydraulic cylinder base is welded to the support base plate of the support system, providing positioning and stability. A single hydraulic pump powers two hydraulic rods.

[0057] The support system serves to support the entire continuously variable load cooling bed billet sensible heat recovery device, and its structure is as follows: Figure 2The system includes a support base plate, a support base plate pivot base, anchor bolts, support ribs, a vertical main support plate, a support top plate, a support top plate pivot base, and the main shaft of the support and hoisting system. A concrete foundation is required beneath the support system, and multiple anchor bolts are used to secure the system to the ground, ensuring structural stability. Pivot bases are welded to both the support base plate and the support top plate, providing a fixed axis of rotation for the movement of the support and hoisting systems.

[0058] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make other changes within the spirit of the invention and apply it to fields not mentioned in the invention. Of course, all such changes made in accordance with the spirit of the invention should be included within the scope of protection claimed by the invention.

Claims

1. A device for recovering sensible heat of a billet in a stepless variable load type cold hearth, characterized by: It includes at least one set of billet sensible heat recovery unit, billet (6) is installed on the cooling bed (5), the upper end of the cooling bed (5) is arranged in parallel along the direction of billet movement at least one set of billet sensible heat recovery unit; Each set of billet sensible heat recovery unit includes support system (1), hydraulic system (2), hoisting system (3) and heat exchanger heat exchange system (4), the support system (1) is vertically installed on the concrete, one side of the upper end of the support system (1) is pivotally connected with the end of the horizontally arranged hoisting system (3), the other side of the upper end of the support system (1) is hoisted with the heat exchanger heat exchange system (4) at the lower end, the heat exchanger heat exchange system (4) recovers the heat of the billet which will be dispersed into the atmosphere, the lower end of the hydraulic system (2) is installed on the support bottom plate (11) of the support system (1), and the upper end of the hydraulic system (2) is connected with the hoisting support cantilever (31) of the hoisting system (3); The heat exchanger heat exchange system (4) includes heat exchanger (41), header heat exchanger connecting pipe (48), header inlet flange (49), header outlet flange (412), heat exchanger main insulation plate (45), reflection wall pivot (42), reflection wall lifting lug (44), heat exchanger lifting lug (43), two reflection walls (47) and two reflection wall side insulation plates (46), The inlet side of the heat exchanger (41) is connected with the header inlet flange (49) through the header heat exchanger connecting pipe (48), the inlet (410) of the header inlet flange (49) is connected with the header, the outlet side of the heat exchanger (41) is connected with the header outlet flange (412) through the header heat exchanger connecting pipe (48), and the outlet (411) of the header outlet flange (412) is connected with the header; wherein, temperature and pressure measuring devices are arranged on the header to monitor the working medium state in the header in real time; The heat exchanger main insulation plate (45) is installed on the heat exchanger (41); the heat exchanger lifting lug (43) is welded on the lower side of the heat exchanger (41), the heat exchanger lifting lug (43) is connected with the reflection wall lifting lug (44) through the reflection wall pivot (42), and the reflection wall lifting lug (44) is welded on the two reflection walls (47); one reflection wall side insulation plate (46) is installed on each reflection wall (47); The control program of the hydraulic system (2) drives the hydraulic piston rod (25) to drive the hoisting system (3) and the heat exchanger heat exchange system (4) to overturn around the support and hoisting system main shaft (18), controls the distance between the heat exchanger (41) and the hot billet, realizes stepless variable load effect, and the heat absorption amount can be controlled to be any value between zero load and maximum load; Since the reflection wall pivot (42) is fixed in only two directions and is free to rotate on the main shaft in the direction of billet movement, the reflection wall is hung on the heat exchanger (41), and whether the heat exchanger (41) rotates or not, the reflection wall is always perpendicular to the ground.

2. A cold-steel billet apparent heat recovery device of stepless variable load type according to claim 1, characterized in that: The support system (1) comprises a support bottom plate (11), a support bottom plate rotating shaft base (12), a plurality of anchor bolts (13), two support rib plates (14), a support back plate (15), a support top plate (16), a support top plate rotating shaft base (17) and a support and hoisting system main shaft (18), the support bottom plate (11) is horizontally arranged and is installed on the concrete through the plurality of anchor bolts (13), the support bottom plate rotating shaft base (12) is installed on the support bottom plate (11), the two support rib plates (14) are vertically and parallel installed on the support bottom plate (11), and the two support rib plates (14) are connected through the support back plate (15) between the two support rib plates (14), the support top plate (16) is fixedly installed on the upper end faces of the two support rib plates (14) and the support back plate (15), the support top plate rotating shaft base (17) is installed on the upper end face of the support top plate (16), and the support and hoisting system main shaft (18) penetrates through the support top plate rotating shaft base (17) and a hoisting support cantilever (31) of a hoisting system (3).

3. A cold-steel billet apparent heat recovery device of stepless variable load type according to claim 1 or 2, characterized in that: The hydraulic system (2) comprises a hydraulic pump (21), a support and hydraulic system main shaft (22), a hydraulic cylinder base (23), a hydraulic cylinder cylinder body (24), a hydraulic piston rod (25), a hydraulic cylinder piston rod top base (26) and a hydraulic and hoisting system main shaft (27), The hydraulic pump (21) and the hydraulic cylinder base (23) are installed on the support bottom plate (11), the lower end of the hydraulic cylinder cylinder body (24) is rotatably installed on the hydraulic cylinder base (23) through the support and hydraulic system main shaft (22), the lower part of the hydraulic piston rod (25) is installed in the hydraulic cylinder cylinder body (24), the hydraulic cylinder piston rod top base (26) is installed on the lower end of the hoisting support cantilever (31) of the hoisting system (3) through the hydraulic and hoisting system main shaft (27), and the upper part of the hydraulic piston rod (25) is connected with the hydraulic cylinder piston rod top base (26).

4. A cold-steel billet apparent heat recovery device of stepless variable load type according to claim 3, characterized in that: The hoisting system (3) comprises a hoisting support cantilever (31), two hoisting normal beams (32), a hoisting tangential beam (33), a hoisting main body fastener (34), a hoisting main body fixed plate (35) and a plurality of hoisting heat exchange connecting pieces (36), One end of the hoisting support cantilever (31) is connected with the support top plate rotating shaft base (17) through the support and hoisting system main shaft (18), the two hoisting normal beams (32) are arranged in parallel, the two hoisting normal beams (32) are connected through the hoisting tangential beam (33) between the two hoisting normal beams (32), the other end of the hoisting support cantilever (31) is connected with one of the hoisting normal beams (32) through the hoisting main body fastener (34), and the plurality of hoisting heat exchange connecting pieces (36) are installed on the lower end faces of the two hoisting normal beams (32) and are connected with a heat exchanger heat exchange system (4).

5. A cold-steel billet apparent heat recovery device of stepless variable load type according to claim 1, characterized in that: The heat exchanger (41) is a light tube row heat exchanger, a membrane wall heat exchanger or a finned tube row heat exchanger.

6. A cold-steel billet apparent heat recovery device of stepless variable load type according to claim 1, characterized in that: The heat exchanger (41) is a vacuum heat collecting tube heat exchanger in a far infrared wavelength segment.

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