Fog cooling device used in heat treatment process of nodular cast iron

Abstract

The utility model belongs to the technical field of heat treatment equipment, and particularly relates to a fog cooling device used in the heat treatment process of nodular cast iron. The device is composed of a sealing box, a pipeline frame and a fan, and the sealing box is of a cuboid structure; the pipeline frame is arranged in the sealing box, and the fan is arranged on the pipeline frame; the two pipeline frames are communicated with each other, the shapes and the perimeters of the two pipeline frames are consistent, and the joint of the two pipeline frames is in a cross shape; according to the ultrasonic atomizer, a nozzle atomizer in an existing ultrasonic atomizer is replaced by the pipeline frame and the fan, water mist generated by the ultrasonic atomizer is further crushed into water mist with smaller particle size under the action of the fan, and the particle size of the water mist sprayed out of the fan is only 5 microns, so that the generated water mist is finer and more uniform; therefore, the surface of the nodular cast iron (casting) is cooled more uniformly, and the quality of the casting is improved to the maximum extent.

Description

Technical Field

[0001] This utility model belongs to the technical field of heat treatment equipment, specifically relating to a mist cooling device used in the heat treatment process of ductile iron. Background Technology

[0002] In existing technologies, the cooling methods for normalizing heat treatment of ductile iron include furnace cooling, air cooling, mist cooling, and water cooling. A mist cooling device refers to a device that atomizes water and sprays it evenly onto the surface of the casting during the normalizing cooling process of metal materials to achieve cooling of the casting. Its cooling capacity is between that of a water cooling device and an air cooling device.

[0003] Regarding the spraying method, existing mist cooling devices use atomizing nozzles to spray the castings. However, these devices suffer from defects such as nozzle clogging, coarse atomized particles, uneven spraying, and the easy generation of water droplets. In such cases, the atomized water mist is directly blown onto the surface of the castings, which will affect the final cooling effect.

[0004] Regarding the spraying location, existing mist cooling devices typically employ top or side spraying. However, neither top nor side spraying can guarantee uniform mist cooling effects across all surfaces of the casting, with the worst cooling effect occurring at the contact surface between the casting and the support frame. To address the poor cooling at the contact surface, existing technologies utilize condensation techniques to cool the casting support frame and reduce temperature differences. However, this type of mist cooling device still suffers from uneven overall cooling of the casting, which negatively impacts the final quality of the casting.

[0005] Furthermore, existing mist cooling devices suffer from complex structures and poor adjustability. The size of the castings is limited by the size of the device, frequently resulting in the awkward situation where the mist cooling device cannot accommodate the castings. Additionally, mist cooling devices also suffer from limited adjustability of the atomization rate, thus restricting the equipment's cooling capacity to a finite range. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies and provide a mist cooling device for the heat treatment process of ductile iron.

[0007] This utility model is achieved through the following technical solution:

[0008] A mist cooling device for heat treatment of ductile iron comprises a sealed box, a pipe frame, and a fan. The sealed box is a cuboid structure. The pipe frame is disposed inside the sealed box, and the fan is disposed on the pipe frame. There are two interconnected pipe frames, with the two pipe frames having the same shape and perimeter, and the connection between the two pipe frames forming a cross shape. Several oval-shaped mist outlets are evenly distributed on the inner side of the pipe frame. The fan covers the mist outlets and is fixed to the pipe frame by a clamp. A connecting pipe is also disposed at the center of the outer side of the connection between the two pipes, with one end connected to the inside of the pipe frame and the other end passing through the sealed box and disposed outside the sealed box. A drain pipe connected to the inside of the sealed box is also disposed at the bottom of the sealed box.

[0009] The pipe frame is square in shape, and the two pipe frames are connected by one four-way pipe, one five-way pipe, eight right-angle bends and twelve straight pipes; the four channels on the four-way pipe are all located on the same plane; the five-way pipe has four channels located on the same plane, and one channel is perpendicular to the other four channels; the channel on the five-way pipe that is perpendicular to the other four channels is a connecting pipe.

[0010] Of the 12 straight pipes, 4 are long pipes and 8 are short pipes, with the length of the long pipes being twice the length of the short pipes. While maintaining the correct ratio of long to short pipe lengths, the lengths of both long and short pipes can be flexibly adjusted according to the size of the casting.

[0011] The number of mist outlets can be flexibly adjusted according to the length of the straight pipe, controlling that the number of mist outlets on each long pipe is ≥2 and the number of mist outlets on each short pipe is ≥1, and the distance between two adjacent mist outlets is ≤10cm.

[0012] To ensure more uniform distribution, mist outlets are also provided on four-way pipes, five-way pipes, and right-angle bends when necessary.

[0013] A latch for suspending castings is provided at the center of the top of the pipe frame.

[0014] The fan is an adjustable fan with a wind speed adjustable in the range of 2m / s-10m / s.

[0015] One end of the connecting pipe, which passes through the sealed box and is located outside the sealed box, is connected to the mist outlet of the ultrasonic atomizer.

[0016] The water mist sprayed from the fan has a particle size of 5μm, and the atomization rate of the ultrasonic atomizer is adjustable within the range of 60ml / min-120ml / min.

[0017] The drain pipe is connected to the water inlet of the ultrasonic atomizer.

[0018] The number of mist outlets is the same as the number of fans, and the length of the mist outlet is greater than the diameter of the fan.

[0019] A movable surface on the sealed box forms a door on the sealed box.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This utility model replaces the nozzle atomizer in the existing ultrasonic atomizer with a pipe frame and a fan. The water mist generated by the ultrasonic atomizer is further broken into smaller particles by the fan. The water mist sprayed from the fan has a particle size of only 5μm, making the generated water mist finer and more uniform. This results in more uniform cooling of the surface of the ductile iron (casting) and maximizes the quality of the casting.

[0022] 2. Because this utility model sprays out the mist through a fan and a mist outlet, it overcomes the defects of the prior art, such as nozzle clogging, coarse atomized particles, uneven spraying, and easy formation of water droplets when using atomizing nozzles. The water mist atomized by the ultrasonic atomizer is dispersed by the fan and then cooled on the surface of the casting. On the one hand, it ensures the uniformity of the spray, and on the other hand, it speeds up the spraying speed, thereby improving the heat exchange rate.

[0023] 3. The pipe frame of this utility model is square in shape, and a latch for suspending the casting is provided at the center of the top of the pipe frame, so that the casting is suspended in the pipe frame during mist cooling. The water mist sprayed from the various spray nozzles on the pipe frame and the fan can perfectly envelop the casting, thereby realizing three-dimensional spraying; overcoming the defects of poor cooling effect and uneven cooling at the contact surface between the casting and the placement rack in the prior art.

[0024] 4. While ensuring the length ratio of the long pipe to the short pipe, the lengths of both the long pipe and the short pipe in this application can be flexibly adjusted according to the size of the casting, thereby ensuring that the equipment of this utility model is not affected by the size of the casting and is applicable to castings of different specifications.

[0025] 5. This utility model combines an ultrasonic sprayer and a fan by setting an adjustable fan. The fan speed is adjustable in the range of 2m / s-10m / s, and the atomization volume of the ultrasonic atomizer is adjustable in the range of 60ml / min-120ml / min. This couples air cooling and mist cooling together, further improving the cooling efficiency of the casting.

[0026] 6. By setting up a sealed box, this utility model allows the casting to be cooled in a relatively sealed environment, increasing the contact between water mist and the casting, thereby improving the cooling capacity.

[0027] 7. The drain pipe of this utility model is connected to the water inlet of the ultrasonic atomizer, so that the water generated by the condensation of water mist in the sealed box can be returned to the ultrasonic atomizer for reuse, thereby saving water resources. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the pipe frame structure of the mist cooling device of this application;

[0029] Figure 2 This is a top view of the pipe frame of the mist cooling device of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the mist cooling device of this application;

[0031] Figure 4 This is a schematic diagram of the fan installation method in the mist cooling device of this application;

[0032] In the diagram: 1-pipe frame; 2-mist outlet; 3-fan; 4-fixing clamp; 5-lock; 6-casting; 7-sealing box; 8-connecting pipe; 9-drainage pipe. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited by the embodiments. Example 1

[0034] A mist cooling device for heat treatment of ductile iron comprises a sealed box, a pipe frame, and a fan. The sealed box is a cuboid structure. The pipe frame is disposed inside the sealed box, and the fan is disposed on the pipe frame. There are two interconnected pipe frames, with the two pipe frames having the same shape and perimeter, and the connection between the two pipe frames forming a cross shape. Several oval-shaped mist outlets are evenly distributed on the inner side of the pipe frame. The fan covers the mist outlets and is fixed to the pipe frame by a clamp. A connecting pipe is also disposed at the center of the outer side of the connection between the two pipes, with one end connected to the inside of the pipe frame and the other end passing through the sealed box and disposed outside the sealed box. A drain pipe connected to the inside of the sealed box is also disposed at the bottom of the sealed box.

[0035] The pipe frame is square in shape, and two pipe frames are connected by one four-way pipe, one five-way pipe, eight right-angle bends, and twelve straight pipes. The four-way pipe has four channels on the same plane; the five-way pipe has four channels on the same plane, and one channel is perpendicular to the other four; the channel perpendicular to the other four channels on the five-way pipe is a connecting pipe. A latch for suspending castings is located at the center of the top of the pipe frame.

[0036] Of the 12 straight pipes, there are 4 long pipes and 8 short pipes, and the length of the long pipes is twice the length of the short pipes.

[0037] The number of mist outlets on each long pipe is controlled to be 3, and the number of mist outlets on each short pipe is 1, with a distance of 3cm between two adjacent mist outlets. The four-way pipe and the five-way pipe also have 1 mist outlet on the side facing the lock.

[0038] The fan is an adjustable fan with a wind speed adjustable in the range of 2m / s-10m / s.

[0039] One end of the connecting pipe, which passes through the sealed box and is located outside the sealed box, is connected to the mist outlet of the ultrasonic atomizer.

[0040] The water mist sprayed from the fan has a particle size of 5μm, and the atomization rate of the ultrasonic atomizer is adjustable within the range of 60ml / min-120ml / min.

[0041] The drain pipe is connected to the water inlet of the ultrasonic atomizer.

[0042] The number of mist outlets is the same as the number of fans, and the length of the mist outlet is greater than the diameter of the fan.

[0043] A movable surface on the sealed box forms a door on the sealed box.

[0044] In use, open the chamber door, suspend the casting to be cooled in the pipe frame using the latches, and close the chamber door to create a relatively sealed space. First, turn on the fan, then turn on the ultrasonic atomizer. The water mist generated by the ultrasonic atomizer enters the pipe frame; some overflows through the mist outlet, while the rest is carried by the fan into the sealed chamber. Both the overflowing and fan-driven mists flow towards the casting surface, absorbing heat and condensing at the bottom of the sealed chamber before returning to the ultrasonic atomizer via the drain pipe for reuse. During the mist cooling process, the fan simultaneously cools the casting surface, achieving a coupling of air cooling and mist cooling. After cooling is complete, turn off the ultrasonic atomizer and fan, open the chamber door, and remove the casting. Example 2

[0045] Set the length of the mist outlet to 75cm, the width of the mist outlet to 30cm, and the diameter of the fan to 50cm. Set the length of the long pipe to 800cm and the length of the short pipe to 400cm. Set the number of mist outlets on each long pipe to 8 and the number of mist outlets on each short pipe to 4, with the distance between any two adjacent mist outlets set to 20cm.

[0046] The fan is an adjustable fan with a wind speed adjustable within the range of 5m / s to 8m / s. The water mist sprayed from the fan has a particle size of 5μm, and the atomization rate of the ultrasonic atomizer is adjustable within the range of 75ml / min to 90ml / min.

[0047] When the device of this embodiment is applied to the forced atomization cooling of castings that have undergone normalizing treatment at a temperature of 900°C for 3 hours, the temperature of the casting drops from 900°C to 220°C after 5 minutes. It can be seen that the cooling efficiency of the device of this embodiment can reach an average of 136°C / min.

Claims

1. A mist cooling device for the heat treatment process of nodular cast iron, which is composed of a sealed box, a pipe frame and a fan, the sealed box is a cuboid structure; the pipe frame is arranged in the sealed box, and the fan is arranged on the pipe frame; characterized in that, The two pipeline frames are connected with each other, the shapes and circumferences of the two pipeline frames are consistent, and the connection part of the two pipeline frames is in the shape of a cross; a plurality of waist circle-shaped mist outlets are uniformly arranged on the inner side of the pipeline frame; the fan is arranged on the mist outlet and is arranged on the pipeline frame through the fixing clamp; a connecting pipe is further arranged at the center of the outer side of the connection part of the two pipelines, one end of the connecting pipe is communicated to the inside of the pipeline frame, and the other end of the connecting pipe is arranged outside the sealing box through the sealing box; a drain pipe is further arranged at the bottom of the sealing box and is communicated to the inside of the sealing box.

2. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, The two pipeline frames are connected by one four-way pipe, one five-way pipe, eight right-angle elbow pipes and twelve straight pipes; the four channels of the four-way pipe are located on the same plane; four channels of the five-way pipe are located on the same plane, and the other channel is perpendicular to the other four channels; the channel of the five-way pipe which is perpendicular to the other four channels is the connecting pipe.

3. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, The shape of the pipeline frame is a square.

4. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, A lock catch for suspending the casting is arranged at the center of the top of the pipeline frame.

5. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, The fan is an adjustable fan with a wind speed in the range of 2m / s-10m / s.

6. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, The end of the connecting pipe which is arranged outside the sealing box through the sealing box is communicated with the mist outlet end of the ultrasonic atomizer.

7. A fog cooling device for use in the heat treatment of nodular cast iron according to claim 6, characterized in that The particle size of the water mist sprayed from the fan is 5μm, and the atomization amount of the ultrasonic atomizer is adjustable in the range of 60ml / min-120ml / min.

8. The atomizing cooling device for the process of heat treatment of nodular cast iron according to claim 6 or 7, characterized in that, The drain pipe is communicated with the water inlet end of the ultrasonic atomizer.

9. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, The number of the mist outlets is consistent with the number of the fans, and the length of the mist outlet is greater than the diameter of the fan.

10. The atomizing cooling device for the spheroidal graphite cast iron heat treatment process according to claim 1, characterized in that, One side of the sealing box is movably arranged on the sealing box to form a box door.

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