Slow cooling device for heat treatment of steel parts

Abstract

The utility model provides a slow cooling device for heat treatment of steel parts, which comprises a mounting frame, a lower cooling platform is arranged on the mounting frame, an upper cooling platform is movably arranged above the lower cooling platform along the vertical direction, an upper cooling layer and a lower cooling layer are respectively arranged in the upper cooling platform and the lower cooling platform, an upper coil pipe and a lower coil pipe are respectively arranged in the upper cooling layer and the lower cooling layer, and the upper coil pipe and the lower coil pipe are arranged in the mounting frame. The upper coil pipe and the lower coil pipe are used for conveying cooling liquid, a gas inlet pipe is arranged on one side of the upper cooling platform, a gas outlet pipe is arranged on the side, opposite to the gas inlet pipe, of the upper cooling platform, and the gas inlet pipe and the gas outlet pipe are used for conveying cooling gas. According to the scheme, through movable arrangement of the upper cooling platform and the lower cooling platform, the device can be suitable for steel parts with different thicknesses; through the arrangement of the upper coil pipe, the lower coil pipe, the air inlet pipe and the air outlet pipe, the device can be switched between an air cooling mode and a liquid cooling mode according to the strength of the steel part, the cooling speed of the steel part is more accurately controlled, and the yield of the steel part is increased.

Description

Technical Field

[0001] The present application relates to the technical field of heat treatment of steel parts, and in particular to a slow cooling device for heat treatment of steel parts. Background Art

[0002] During the steel production process, hot steel parts are typically kept warm and slowly cooled. By controlling the cooling rate, white spot defects within the steel parts are eliminated, while cracks caused by thermal and structural stresses during the cooling process are avoided. Therefore, effectively controlling the cooling rate of hot steel parts is crucial for improving product yield. However, most steel production processes use direct oil or water cooling. This process not only subjects the steel parts to significant cooling shock, making them susceptible to deformation and uneven microstructure, but also prevents the cooling rate from being accurately and flexibly controlled according to the properties of the steel parts to be produced. Therefore, improvements are necessary. Utility Model Content

[0003] In order to address the above-mentioned deficiencies in the prior art, the present application provides a slow cooling device for heat treatment of steel parts, which can more accurately and appropriately control the cooling rate of the steel parts according to the properties of the steel parts themselves.

[0004] In order to achieve the above purpose, the utility model adopts the following technologies:

[0005] A slow cooling device for heat treatment of steel parts comprises a mounting frame, on which a lower cooling platform is provided, an upper cooling platform is provided above the lower cooling platform for movement in a vertical direction, the upper cooling platform comprises a horizontal plate and four side plates arranged around the horizontal plate, the lower cooling platform is provided with through grooves corresponding to the four side plates of the upper cooling platform around the four side plates, an upper cooling layer and a lower cooling layer are provided in the upper cooling platform and the lower cooling platform respectively, an upper coil and a lower coil are provided in the upper cooling layer and the lower coil are used for conveying cooling liquid, an air inlet pipe is provided on one side of the upper cooling platform, and an air outlet pipe is provided on the upper cooling platform on the side opposite to the air inlet pipe, the air inlet pipe and the air outlet pipe are used for conveying cooling gas.

[0006] The beneficial effects of the utility model are as follows: through the movable setting of the upper cooling platform and the lower cooling platform, the device can be applied to steel parts of different thicknesses; through the setting of the upper coil, the lower coil, the air inlet pipe and the air outlet pipe, the device can switch between air cooling and liquid cooling according to the strength of the steel parts, more accurately control the cooling speed of the steel parts, and improve the yield rate of the steel parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0008] Figure 1It is a schematic diagram of the overall structure of an embodiment of the present application.

[0009] Figure 2 It is a front view of the overall structure of the embodiment of the present application.

[0010] Figure 3 It is a schematic diagram of the relative positions of the upper cooling platform and the lower cooling platform in the embodiment of the present application.

[0011] Figure 4 It is a schematic diagram of the relative positions of the upper cooling platform and the lower cooling platform in the embodiment of the present application. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0013] The present application provides a slow cooling device for heat treatment of steel parts, such as Figure 1 、 Figure 3 and Figure 4 As shown, it includes a mounting frame 1, on which a lower cooling platform 2 is provided, and an upper cooling platform 3 is provided above the lower cooling platform 2 for movement in the vertical direction, the upper cooling platform 3 includes a horizontal plate and four side plates arranged around the horizontal plate, and the lower cooling platform 2 is provided with through grooves corresponding to the four side plates of the upper cooling platform 3 around it. When the upper cooling platform 3 moves downward, the upper cooling platform 3 will form a closed space with the lower cooling platform 2, which can accommodate steel parts to be processed of different heights. An upper cooling layer 31 and a lower cooling layer 21 are respectively provided in the upper cooling platform 3 and the lower cooling platform 2, and an upper coil 311 and a lower coil 211 are respectively provided in the upper cooling layer 31 and the lower cooling layer 21, which are used to transport cooling liquid, an air inlet pipe 32 is provided on one side of the upper cooling platform 3, and an air outlet pipe 33 is provided on the opposite side of the air inlet pipe 32 of the upper cooling platform 3, and the air inlet pipe 32 and the air outlet pipe 33 are used to transport cooling gas.

[0014] During application, different slow cooling methods are selected based on the strength of the material being processed. Air cooling has a slower cooling rate, while liquid cooling has a faster cooling rate. Due to this difference in cooling speed, air cooling is suitable for materials with low cooling speed requirements, while liquid cooling is suitable for materials with strict cooling speed requirements.

[0015] First, place the steel parts on the lower cooling platform 2, where the steel parts can be put in and taken out by setting up conveying mechanisms on both sides of the mounting frame 1 in the length direction, and then move the upper cooling platform 3 downward. Due to the different thicknesses of the steel parts, the heights of the upper cooling platform 3 are different. At this time, the upper cooling layer 31 of the upper cooling platform 3 is close to the upper surface of the steel parts, and the lower cooling layer 21 of the lower cooling platform 2 is close to the lower surface of the steel parts. The upper cooling platform 3 and the lower cooling platform 2 clamp the upper and lower surfaces of the steel parts, which not only prevents the steel parts from deforming during the cooling process, but also shortens the heat transfer path between the cooling liquid and the steel parts, thereby improving the heat exchange efficiency between the two.

[0016] If the steel workpiece is made of high-strength or high-hardness material, liquid cooling should be used to slowly cool it. Cooling liquid at the same temperature is simultaneously introduced into the upper coil 311 and the lower coil 211. The heat from the steel workpiece is gradually removed by the cooling liquid in the upper and lower coils 311, achieving a slow cooling effect.

[0017] If the steel workpiece is low-strength, prone to carbonization, or prone to thermal cracking, air cooling should be used to slowly cool it. Cooling gas is introduced through the air inlet pipe 32. Due to its low density, the cooling gas gradually settles at the bottom of the enclosed space formed by the upper cooling platform 3 and the lower cooling platform 2. The cooling gas then flows through the area between the side of the steel workpiece and the enclosed space. After absorbing heat from the steel workpiece, the gas density gradually increases before it flows out of the enclosed space through the air outlet pipe 33.

[0018] By selecting cooling media in different states according to the properties of the steel parts and then controlling the temperature of the cooling medium during the cooling process, the cooling rate of the steel parts can be controlled more systematically and accurately, thereby improving the yield rate of the steel parts.

[0019] Specifically, such as Figure 2 and Figure 4 As shown, a first circulating water pump 4 and a first water storage tank 5 are provided below the lower cooling platform 2. The first water storage tank 5 has a built-in cooling system, which is used to cool the cooling liquid that has absorbed heat and flows out of the lower coil 211. The cooled cooling liquid enters the lower coil 211 again under the action of the first circulating water pump 4 to absorb the heat of the steel parts to be processed, and circulates in this process. The water inlet end of the lower coil 211 is connected to the water outlet end of the first circulating water pump 4, and the water outlet end of the lower coil 211 is connected to the water inlet end of the first water storage tank 5, wherein the water inlet end of the first circulating water pump 4 and the water outlet end of the first water storage tank 5 are connected by a pipe.

[0020] Specifically, such as Figure 2 and Figure 4As shown, a second circulating water pump 6 and a second water storage tank 7 are provided above the upper cooling platform 3. The second water storage tank 7 has a built-in cooling system. The cooling system is used to cool the cooling liquid that has absorbed heat and flows out of the upper coil 311. The cooled cooling liquid enters the upper coil 311 again under the action of the second circulating water pump 6 to absorb the heat of the steel parts to be processed, and circulates in this process. The water inlet end of the upper coil 311 is connected to the water outlet end of the second circulating water pump 6, and the water outlet end of the upper coil 311 is connected to the water inlet end of the second water storage tank 7, wherein the water inlet end of the second circulating water pump 6 and the water outlet end of the second water storage tank 7 are connected by a pipe.

[0021] Specifically, such as Figure 1 and Figure 2 As shown, the air inlet pipe 32 includes a first air inlet section 321 and a second air inlet section 323, with a first telescopic hose 322 connected between the first and second air inlet sections 321 and 323. The air outlet pipe 33 includes a first and second air outlet section 331 and 333, with a second telescopic hose 332 connected between the first and second air outlet sections 331 and 333. A gas circulation device and a gas cooling device are provided between the first air inlet section 321 and the first air outlet section 331, and are fixedly connected to the gas circulation device and the gas cooling device. During the upward or downward movement of the upper cooling platform 3, the first and second telescopic hoses 322 and 332 shorten or lengthen during this process, thereby maintaining the connection and gas delivery function.

[0022] Specifically, such as Figure 1 and Figure 2 As shown, the top of the mounting frame 1 is provided with multiple screws 8. Two screws 8 on one side are coaxially mounted above each other, with a driving pulley coaxially mounted above each. A motor 9 is mounted above each of the driving pulleys, and the output shaft of the motor 9 passes through the driving pulleys and is connected to the screws 8. Two screws 8 on the other side are coaxially mounted above each other, with driven pulleys coaxially mounted above each other. The driving and driven pulleys on the same side are movably connected via a belt.

[0023] In application, the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application.

Claims

1. A slow cooling device for heat treatment of steel parts, characterized in that: The invention comprises a mounting frame (1), on which a lower cooling platform (2) is provided, an upper cooling platform (3) is provided above the lower cooling platform (2) and is movable in a vertical direction, the upper cooling platform (3) comprises a horizontal plate and four side plates arranged around the horizontal plate, the lower cooling platform (2) is provided with through grooves corresponding to the four side plates of the upper cooling platform (3) around the four sides, the upper cooling platform (3) and the lower cooling platform (2) are respectively provided with an upper cooling layer (31) and a lower cooling layer (21), the upper cooling layer (31) and the lower cooling layer (21) are respectively provided with an upper coil (311) and a lower coil (211), the upper coil (311) and the lower coil (211) are used for conveying cooling liquid, an air inlet pipe (32) is provided on one side of the upper cooling platform (3), and an air outlet pipe (33) is provided on the opposite side of the air inlet pipe (32), the air inlet pipe (32) and the air outlet pipe (33) are used for conveying cooling gas.

2. The slow cooling device for heat treatment of steel according to claim 1, characterized in that: A first circulating water pump (4) and a first water storage tank (5) are provided below the lower cooling platform (2). The first water storage tank (5) has a built-in cooling system. The water inlet end of the lower coil (211) is connected to the water outlet end of the first circulating water pump (4), and the water outlet end of the lower coil (211) is connected to the water inlet end of the first water storage tank (5). The water inlet end of the first circulating water pump (4) and the water outlet end of the first water storage tank (5) are connected via a pipeline.

3. The slow cooling device for heat treatment of steel according to claim 1, characterized in that: A second circulating water pump (6) and a second water storage tank (7) are provided above the upper cooling platform (3). The second water storage tank (7) has a built-in cooling system. The water inlet end of the upper coil (311) is connected to the water outlet end of the second circulating water pump (6), and the water outlet end of the upper coil (311) is connected to the water inlet end of the second water storage tank (7). The water inlet end of the second circulating water pump (6) and the water outlet end of the second water storage tank (7) are connected via a pipeline.

4. The slow cooling device for heat treatment of steel according to claim 1, characterized in that: The air inlet pipe (32) comprises a first air inlet section (321) and a second air inlet section (323), and a first telescopic hose (322) is connected between the first air inlet section (321) and the second air inlet section (323); the air outlet pipe (33) comprises a first air outlet section (331) and a second air outlet section (333), and a second telescopic hose (332) is connected between the first air outlet section (331) and the second air outlet section (333).

5. The slow cooling device for heat treatment of steel according to claim 1, characterized in that: A plurality of screw rods (8) are provided on the top of the mounting frame (1), and a driving pulley is coaxially provided above the two screw rods (8) on one side, and a motor (9) is provided above the driving pulley, and an output shaft of the motor (9) passes through the driving pulley and is connected to the screw rod (8); a driven pulley is coaxially provided above the two screw rods (8) on the other side; wherein the driving pulley and the driven pulley on the same side are movably connected via a belt.

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