Production line for efficient heat treatment of bars

Abstract

The invention discloses a production line for efficient heat treatment of bars, and belongs to the field of quenching. Comprising a first conveying device, a quenching pool, an overflow pool, a quenching liquid injection device, a first air cooling device, a second conveying device and a second air cooling device, the first conveying device is used for enabling a rod body to be quenched to sequentially pass through the quenching pool and the first air cooling device; the second conveying device is used for enabling the rod body cooled by the first air cooling device to pass through the second air cooling device; the overflow pool is wrapped outside the quenching pool, and the quenching liquid injection device injects the quenching liquid into the quenching pool. The quenching process has the beneficial effects that the quenching efficiency is remarkably improved, through the combined quenching process of water cooling and two-time air cooling, the traditional static setting time is replaced or greatly shortened by active air cooling, the dissipation speed of heat in a workpiece is greatly increased, and therefore the whole quenching treatment period is shortened.

Description

Technical Field

[0001] This application relates to the field of quenching, and more specifically, to a production line for efficient heat treatment of bar stock. Background Technology

[0002] In existing technologies, water-cooled quenching is commonly used for quenching rod-shaped workpieces. After water cooling in the quenching tank, the surface temperature of the workpiece drops rapidly, but a significant amount of internal heat remains. This residual heat needs to be slowly dissipated through heat conduction while the workpiece is stationary, a process that often takes a long time. This prolonged waiting period significantly slows down the entire quenching production line, resulting in low production efficiency and failing to meet the demands of efficient, continuous production. Therefore, there is an urgent need for a high-efficiency quenching production line that can accelerate the dissipation of internal heat from the workpiece and shorten the overall quenching cycle. Summary of the Invention

[0003] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0004] To address the technical problems mentioned in the background section, some embodiments of this application provide a production line for efficient heat treatment of bar stock, comprising: a first conveying device, a quenching tank, an overflow tank, a quenching liquid injection device, a first air-cooling device, a second conveying device, and a second air-cooling device; the first conveying device is used to sequentially pass the bar stock to be quenched through the quenching tank and the first air-cooling device; the second conveying device is used to pass the bar stock cooled by the first air-cooling device through the second air-cooling device; the overflow tank is enclosed outside the quenching tank, and the quenching liquid injection device injects the quenching liquid into the quenching tank.

[0005] Furthermore, gates and control mechanisms for opening and closing the gates are provided at both ends of the quenching pool.

[0006] Furthermore, the first conveying device includes a plurality of first conveying rollers and a first driving member that drives the plurality of first conveying rollers to rotate; the second conveying device includes a plurality of second conveying rollers and a second driving member that drives the plurality of second conveying rollers to rotate; the plurality of first conveying rollers are divided into a first high-speed region and a first low-speed region; the plurality of second conveying rollers are divided into a second high-speed region and a second low-speed region; the first high-speed region at least covers the first air-cooling device and the quenching tank, and the second high-speed region at least covers the second air-cooling device.

[0007] Furthermore, a draining device is provided at the bottom of the quenching pool for discharging the quenching liquid outward.

[0008] Furthermore, the first conveying roller and the second conveying roller are provided with multiple limiting parts; the bar to be quenched is located between any two of the limiting parts.

[0009] Furthermore, the limiting portion has a helical surface whose normal direction matches the axial direction of the first conveying roller or the second conveying roller.

[0010] Furthermore, the distance between any two of the spiral surfaces is greater than the diameter of the bar to be quenched but less than twice the diameter; the height of the spiral surface is greater than the radius of the bar to be quenched; and the pitch of the spiral surface is greater than the diameter of the bar to be quenched.

[0011] Furthermore, the limiting part is disposed on the first conveying roller located in the first high-speed zone and on the second conveying roller located in the second high-speed zone.

[0012] Furthermore, the first driving member at least drives the first conveying roller located in the first air-cooling device and the quenching tank to reciprocate; the second driving member at least drives the second conveying roller located in the second air-cooling device to reciprocate.

[0013] Furthermore, a plurality of the first conveying rollers are arranged in a linear array along a first straight line, and a plurality of the second conveying rollers are arranged in a linear array along a second straight line; the first straight line and the second straight line are arranged side by side, and the conveying direction of the first conveying rollers is opposite to the conveying direction of the second conveying rollers.

[0014] The beneficial effects of this application are as follows:

[0015] 1. Significantly improve quenching efficiency: By using a combination of water cooling and two-stage air cooling quenching processes, active air cooling (and evaporative heat absorption) replaces or significantly shortens the traditional passive settling time, greatly accelerating the dissipation of heat from the workpiece and thus shortening the entire quenching cycle.

[0016] 2. Ensure quenching quality and uniformity: The reciprocating rotation design of the conveyor rollers allows the bar to move back and forth and roll axially during air cooling and water cooling processes. This ensures that the bar and all sections are in uniform contact with the cooling medium, effectively avoiding deformation or performance differences caused by uneven cooling and improving the quenching quality of the product.

[0017] 3. Achieve continuous and efficient production: The closed design of the quenching tank, the continuous renewal and discharge mechanism of the quenching fluid, and the automated conveying system enable the bars to achieve continuous and automated assembly line operation with a compact spatial layout and high production efficiency.

[0018] 4. Effectively ensures workpiece cleanliness: By installing air filters and unique water filters in the air inlet and water inlet pipes of the air-cooling system, dust and impurities in the water are effectively prevented from adhering to the surface of the high-temperature rod, ensuring the surface quality of the workpiece after quenching. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0020] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0021] In the attached diagram:

[0022] Figure 1 This is an overall schematic diagram based on an embodiment of this application;

[0023] Figure 2 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the first conveying device and some surrounding parts;

[0024] Figure 3 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the first drive member and the first conveying roller;

[0025] Figure 4 This is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the quenching tank;

[0026] Figure 5 A schematic diagram of a portion of the embodiment mainly shows the structure of the gate and some surrounding parts;

[0027] Figure 6 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the first air-cooling device;

[0028] Figure 7 This is a structural diagram of a part of the embodiment, mainly showing the structure of the exhaust pipe and the drain pipe;

[0029] Figure 8 This is a structural schematic diagram as part of an embodiment, mainly showing the structure of the first conveying roller and the limiting part.

[0030] Figure label:

[0031] 1. First conveying device; 11. First conveying roller; 111. Limiting part; 112. Spiral surface; 12. First driving component; 13. First high-speed zone; 14. First low-speed zone;

[0032] 2. Quenching tank; 21. Gate; 22. Control mechanism;

[0033] 3. Overflow pool;

[0034] 4. First air-cooled cooling device; 41. Blower; 42. Exhaust pipe; 43. Water pump; 44. Drain pipe;

[0035] 5. Second conveying device; 51. Second high-speed zone; 52. Second low-speed zone;

[0036] 6. Second air-cooled cooling device. Detailed Implementation

[0037] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0038] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0039] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0040] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0041] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Reference Figure 1-8 ,

[0043] A production line for high-efficiency quenching of bars includes: a first conveying device 1, a quenching tank 2, an overflow tank 3, a quenching liquid injection device, a first air-cooling device 4, a second conveying device 5, and a second air-cooling device 6. The first conveying device 1 transports the bars to be quenched sequentially through the quenching tank 2 and the first air-cooling device 4. The second conveying device 5 transports the bars, cooled by the first air-cooling device 4, through the second air-cooling device 6. The overflow tank 3 surrounds the quenching tank 2, and the quenching liquid injection device injects the quenching liquid into the quenching tank 2. The bars to be quenched, transported by the first conveying device 1 and the second conveying device 5, undergo sequential water-cooling quenching in the quenching tank 2, a first air-cooling quenching from the first air-cooling device 4, and a second air-cooling quenching from the second air-cooling device 6. This achieves a combination of water cooling and air cooling for quenching the workpiece. Quenching in quenching tank 2 cannot completely reduce the temperature of the workpiece, and preheating still exists inside the workpiece. It needs to be left to stand for a long time to eliminate the internal heat, which leads to an excessively long overall quenching time. In this application, the bar with quenching treatment is quenched in quenching tank 2 and then air-cooled twice. The air cooling is equivalent to the workpiece being left to stand, which increases the speed at which the internal heat dissipates to the outside of the workpiece during the standing period, thus improving the efficiency of the quenching process.

[0044] Specifically, the quenching pool 2 is equipped with gates 21 at both ends and a control mechanism 22 for opening and closing the gates 21. When the first conveying device 1 conveys the bar to be quenched to the quenching pool 2, the control mechanism 22 closes the gates 21 to seal the quenching pool 2, and then the quenching liquid is injected into the quenching pool 2, submerging the bar to be quenched. After filling the quenching pool 2, the quenching liquid overflows into the overflow pool 3, thereby continuously replacing the quenching liquid in the quenching pool 2 and preventing the temperature of the quenching liquid in the quenching pool 2 from rising and affecting the quenching effect on the bar to be quenched.

[0045] Specifically, the first conveying device 1 includes a plurality of first conveying rollers 11 and a first driving member 12 that drives the plurality of first conveying rollers 11 to rotate; the second conveying device 5 includes a plurality of second conveying rollers and a second driving member that drives the plurality of second conveying rollers to rotate; the plurality of first conveying rollers 11 are divided into a first high-speed region 13 and a first low-speed region 14; the plurality of second conveying rollers are divided into a second high-speed region 51 and a second low-speed region 52; the first high-speed region 13 at least covers the first air-cooling device 4 and the quenching tank 2, and the second high-speed region 51 at least covers the second air-cooling device 6.

[0046] The bar to be quenched is conveyed by the rotation of multiple first conveying rollers 11 and multiple second conveying rollers. The multiple first conveying rollers 11 and multiple second conveying rollers are arranged at intervals. Therefore, whether it is water cooling of quenching liquid or air cooling of first air cooling device 4 and second air cooling device 6, the bar to be quenched can be cooled through the first conveying device 1 and the second conveying device 5.

[0047] Specifically, multiple first conveying rollers 11 are arranged in a linear array along a first straight line, and multiple second conveying rollers are arranged in a linear array along a second straight line; the first and second straight lines are arranged side by side, and the conveying direction of the first conveying rollers 11 is opposite to the conveying direction of the second conveying rollers. This arrangement can save space in the overall equipment by using a double-row conveying method.

[0048] Specifically, a draining device is provided at the bottom of the quenching tank 2 to discharge the quenching liquid. The draining device uses a combination of a drain pipe and a control valve to allow the quenching liquid in the quenching tank 2 to be discharged outwards. This ensures that when the rod needs to be transported away from the quenching tank 2 after quenching, the quenching liquid in the quenching tank 2 is discharged, preventing the quenching liquid from overflowing into other positions of the first conveying device 1.

[0049] Specifically, multiple limiting parts 111 are provided on the first conveying roller 11 and the second conveying roller; the bar to be quenched is located between any two of the limiting parts 111. The limiting parts 111 are used to separate multiple bars on the first conveying roller 11 or the second conveying roller to prevent the bars from colliding with each other and affecting the quality.

[0050] Specifically, the limiting part 111 has a helical surface 112 whose normal direction matches the axial direction of the first conveying roller 11 or the second conveying roller. The distance between any two helical surfaces 112 is greater than the diameter of the bar to be quenched but less than twice the diameter; the height of the helical surface 112 is greater than the radius of the bar to be quenched; the pitch of the helical surface 112 is greater than the diameter of the bar to be quenched. The helical surface 112 provided on the limiting part 111 is designed so that when the first conveying roller 11 or the second conveying roller rotates, the helical part can push the bar to move on the first conveying roller 11 or the second conveying roller, and the direction of movement is along the axial direction of the first conveying roller 11 or the second conveying roller. The first driving member 12 drives the first conveying roller 11 located in the first air-cooling device 4 and the quenching tank 2 to reciprocate; the second driving member drives the second conveying roller located in the second air-cooling device 6 to reciprocate. When the first conveying roller 11 and the second conveying roller reciprocate, the rod on the first conveying roller 11 and the second conveying roller can not only move back and forth, but also move left and right. The rod can move back and forth to different positions for air cooling or water cooling, making it easier to cool evenly. At the same time, the rod can also move left and right. Left and right movement refers to the left and right rolling of the rod under the action of the spiral surface 112, which can make every part of the rod come into uniform contact with air cooling or water cooling, further improving the uniformity of the cooling process of the rod and improving the efficiency and quality of quenching treatment.

[0051] Specifically, the limiting part 111 is disposed on the first conveying roller 11 located in the first high-speed zone and on the second conveying roller located in the second high-speed zone.

[0052] In some other embodiments, the first air-cooled cooling device 4 and the second air-cooled cooling device 6 are the same. Taking the first air-cooled cooling device 4 as an example, the first air-cooled cooling device 4 includes: a blower 41 and multiple exhaust pipes 42 connected to the blower 41. The exhaust pipes 42 are arranged in two groups: an upper exhaust pipe group 42 and a lower exhaust pipe group 42. The upper exhaust pipe group 42 is located above the first conveying roller 11, and the lower exhaust pipe group 42 is located below the first conveying roller 11. This allows the airflow to be blown onto the rod body, which moves back and forth and left and right on the first conveying roller 11, thus ensuring that the convective airflow is more evenly distributed on the rod body and quickly cools it down. The first air-cooling device 4 also includes a water pump 43 and a drain pipe 44. The drain pipe 44 is provided in two sets, namely an upper drain pipe 44 set and a lower drain pipe 44 set. The upper drain pipe 44 set is located above the first conveying roller 11, and the lower drain pipe 44 set is located below the first conveying roller 11. The water pump 43 will discharge water through the drain pipe 44 and distribute it to the rod body. The presence of water on the rod body can play an auxiliary role in cooling. The water will also evaporate under the action of the convection wind, which can absorb heat and reduce the temperature of the convection wind, thereby improving the efficiency of air-cooling and further improving the quenching speed and quenching quality of the rod body.

[0053] Among them, the drain pipe 44 is set between multiple exhaust pipes 42, so that after the water is discharged, it is quickly sprayed onto the rod with the help of the exhaust air, and is sprayed onto the rod with greater kinetic energy under the action of the exhaust air, so that the water is quickly bounced off the rod, increasing the contact range between the water and the rod, and improving the range and efficiency of water to assist in cooling the rod.

[0054] Multiple exhaust pipes 42 are distributed in a rectangular array, resulting in gaps between them. Drain pipes 44 are horizontally positioned in the gaps and are welded together in a grid pattern. That is, multiple drain pipes 44 are connected together to form a grid pipeline, and the exhaust pipes 42 are located within the grid of the grid pipeline. This allows the drain pipes 44 to be distributed more evenly to drain water onto the rod.

[0055] Blower 41 draws in external air through the air inlet pipe and discharges it through the exhaust pipe 42. Water pump 43 draws water from an external water source through the water inlet pipe and discharges it through the drain pipe 44. An air filter is installed in the air inlet pipe and a water filter is installed in the water inlet pipe to prevent dust, impurities, or poor-quality water from coming into contact with the rod body, which could cause impurities to adhere to the surface of the rod body and affect the subsequent quenching effect.

[0056] The water purification filter element includes a filter screen, filter cotton, and an external connecting pipe. The external connecting pipe connects to the inlet pipe, forming a cross shape with the inlet pipe. The filter cotton is inserted into the external connecting pipe and penetrates the inlet pipe. The inlet pipe is connected to a water source through the external connecting pipe; one end of the inlet pipe is connected to the water pump 43, and the other end is sealed. One end of the external connecting pipe is for inserting the filter cotton, and the other end is connected to the water source. The end of the external connecting pipe where the filter cotton is inserted has a threaded cap, which is threadedly connected to the external connecting pipe. Water is thus injected into the inlet pipe perpendicular to it, causing dust and impurities in the water to be flushed to the bottom of the filter cotton. In contrast, in traditional designs, water is directly injected into the inlet pipe, and some dust and impurities in the water cannot remain on the filter surface. This results in the water flow direction perfectly matching the inlet pipe, causing some dust and impurities to be flushed into the inlet pipe. However, in the solution of this application, after water enters the filter cotton, some water will enter the position of the threaded cap of the outer pipe and then overflow outward, and some water will directly overflow outward from the external part of the filter cotton located in the water inlet pipe. However, the water overflows outward in a circumferential direction, and most of the water overflows outward in a direction that will not come into contact with the position of dust and impurities, thereby greatly improving the effect and efficiency of water purification.

[0057] In other embodiments, the bottom of the quenching tank 2 is a narrow, conical structure, and the upper part is a rectangular cuboid. A drain outlet is provided at the bottom of the quenching tank 2, and the drain outlet is connected to a drain pipe. A filter screen is installed at the drain outlet to filter out metal debris from the quenching liquid. The filter screen has a rectangular cuboid shape. One end of the filter screen is fixed to the drain outlet, and the other end has an opening. The area of ​​the opening is smaller than the area of ​​the filter screen, so that the metal debris filtered out by the filter screen can be contained in the cavity of the filter screen for subsequent unified processing.

[0058] In addition to heat treatment, this application can also be used in quenching and tempering processes, or other processes that require direct or indirect cooling of metals.

[0059] Workflow:

[0060] Loading and Sealing: The bar to be quenched is placed on the first conveying device 1. The first conveying device 1 transports it to the quenching tank 2, and the control mechanism 22 then closes the gates 21 at both ends of the quenching tank 2, so that the quenching tank 2 forms a closed space.

[0061] Water-cooled quenching: The quenching fluid injection device injects quenching fluid into the quenching tank 2 until the quenching fluid completely submerges the rod and begins to overflow into the overflow tank 3. The rod undergoes thorough water-cooled quenching in the quenching tank 2. During the quenching process, the overflow tank 3 continuously receives the overflowing high-temperature quenching fluid, while fresh low-temperature quenching fluid is continuously injected to maintain the cooling efficiency of the quenching fluid in the tank.

[0062] Drainage and Conveying: After water quenching is completed, the drainage device drains the quenching liquid from the quenching pool 2. Then, the gate 21 is opened, and the first conveying device 1 conveys the rod out of the quenching pool 2.

[0063] First air-cooling process: The rod is fed into the first air-cooling device 4 by the first conveying device 1. During this process, the blower 41 generates convective air, which is evenly blown onto the rod through the upper and lower exhaust pipes 42; at the same time, the water pump 43 sprays clean water onto the surface of the rod through the drain pipe 44. The water evaporates rapidly and absorbs heat under the action of the airflow, achieving efficient and uniform cooling of the rod. In this stage, the first conveying roller 11 reciprocates, causing the rod to move back and forth and roll left and right, ensuring that there are no dead spots in the cooling process.

[0064] Transfer and Second Air-Cooling: After the first air-cooling, the rod is transferred to the second conveying device 5. The second conveying device 5 sends it into the second air-cooling device 6 for a similar air-cooling (which may include spraying) process to further ensure that the heat inside the rod is thoroughly and evenly dissipated.

[0065] Material unloading: The bars that have completed all quenching processes are transported to the end of the production line for unloading and collection.

[0066] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A production line for efficient heat treatment of bars, characterized in that, The production line comprises a first conveying device, a quenching pool, an overflow pool, a quenching liquid injection device, a first air cooling device, a second conveying device and a second air cooling device. The first conveying device is used to make the rod to be quenched pass through the quenching pool and the first air cooling device in sequence; the second conveying device is used to make the rod cooled by the first air cooling device pass through the second air cooling device. The overflow pool is arranged outside the quenching pool, and the quenching liquid injection device injects the quenching liquid into the quenching pool.

2. The production line for efficiently heat treating rod according to claim 1, wherein: both ends of the quenching pool are provided with gates and a control mechanism for controlling the opening and closing of the gates.

3. The production line for efficiently heat treating rod according to claim 2, wherein: the first conveying device comprises a plurality of first conveying rollers and a first driving member for driving the first conveying rollers to rotate; the second conveying device comprises a plurality of second conveying rollers and a second driving member for driving the second conveying rollers to rotate; the first conveying rollers are divided into a first high-speed rotating area and a first low-speed rotating area; the second conveying rollers are divided into a second high-speed rotating area and a second low-speed rotating area; the first high-speed rotating area at least covers the first air cooling device and the quenching pool, and the second high-speed rotating area at least covers the second air cooling device.

4. The production line for efficiently heat treating rod according to claim 2, wherein: the bottom of the quenching pool is provided with a liquid discharge device for discharging the quenching liquid outward.

5. The production line for efficiently heat treating rod according to claim 2, wherein: a plurality of limiting portions are arranged on the first conveying rollers and the second conveying rollers; the rod to be quenched is located between any two limiting portions.

6. The production line for efficiently heat treating rod according to claim 5, wherein: the limiting portions have helical surfaces with normal directions matching the axial directions of the first conveying rollers or the second conveying rollers.

7. The production line for efficiently heat treating rod according to claim 6, wherein: the distance between any two helical surfaces is greater than the diameter of the rod to be quenched and less than twice the diameter; the height of the helical surface is greater than the radius of the rod to be quenched; and the pitch of the helical surface is greater than the diameter of the rod to be quenched.

8. The production line for efficiently heat treating rod according to claim 7, wherein: the limiting portions are arranged on the first conveying rollers located in the first high-speed rotating area and on the second conveying rollers located in the second high-speed rotating area.

9. The production line for efficiently heat treating rod according to claim 8, wherein: the first driving member drives the first conveying rollers located in the first air cooling device and the quenching pool to reciprocate; and the second driving member drives the second conveying rollers located in the second air cooling device to reciprocate.

10. The production line for efficiently heat treating rod according to claim 9, wherein: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A plurality of the first conveying rollers are distributed along a first linear linear array, and a plurality of the second conveying rollers are distributed along a second linear linear array; The first linear line and the second linear line are arranged side by side, and the conveying direction of the conveying roller of the first conveying roller is opposite to the conveying direction of the second conveying roller.

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