Device for increasing the cooling speed after heat treatment of cast steel parts

Abstract

The utility model discloses a device that improves cooling speed after steel casting heat treatment, aims at solving the problem of the unqualified inner layer mechanical property caused by the uneven heat dissipation of the inner and outer layers during the cooling of the steel casting. The device comprises a heat treatment trolley, a mounting table and an axial flow fan, the axial flow fan is arranged on the mounting table, a sprayer connecting water supply pipe is arranged on the axial flow fan, and the axial flow fan is installed through a support assembly that can be vertically and horizontally rotated. The support assembly comprises a base, a connecting seat and a support frame of tripod structure, and the fan multi-angle adjustment is realized through limiting bolts and worm gear transmission. During work, the angle-adjustable axial flow fan is matched with water mist spraying to accelerate the air cooling and flow between the steel castings and make the steel castings on the heat treatment trolley uniformly cooled. The actual application shows that the device effectively improves the uneven cooling problem, the average strength of the steel casting is improved by 20-40% and the impact work is improved by 50-80% through detection, the product quality is guaranteed, and the product delivery and on-time delivery are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment technology, and in particular to a device for improving the cooling rate of cast steel parts after heat treatment. Background Technology

[0002] The company manufactures marine low-speed engines and cast steel parts for shipbuilding, hydropower, mining, and metallurgy. These cast steel parts require heat treatment to refine the grain structure, improve mechanical properties, and relieve stress.

[0003] The company uses an 8m×4m×3.5m trolley-type gas-fired heat treatment furnace with a capacity of 100 tons for heat treatment of cast steel parts. During the cooling process after heat treatment, the outer layers of cast steel parts on the trolley dissipate heat quickly, while the inner layers dissipate heat slowly. This results in significant differences in the mechanical properties of the inner and outer layers, and in some cases, the mechanical properties of some inner layers fail to meet standards, requiring further heat treatment. This impacts product acceptance and delivery times. Summary of the Invention

[0004] The technical problem to be solved by this utility model is that when the cast steel parts are cooled, the outer layer of cast steel parts on the trolley dissipates heat quickly while the inner layer of cast steel parts dissipates heat slowly, resulting in the mechanical properties of the inner layer of cast steel parts being unqualified.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a device for improving the cooling rate of cast steel parts after heat treatment, including a heat treatment trolley, a mounting platform connected to both sides of the heat treatment trolley and an axial flow fan arranged on the mounting platform. The axial flow fans are equidistantly arranged on the mounting platform, and a sprayer is installed on the axial flow fan. The sprayer is connected to a water supply pipe. The axial flow fans are installed on a support assembly on the mounting platform, and the support assembly can rotate vertically and horizontally.

[0006] Preferably, the support assembly includes a base fixed on the mounting platform, a connecting seat vertically rotatably arranged on the top of the base, a support frame fixed on the connecting seat, the middle part of the axial flow fan being horizontally rotatably connected to the top of the support frame, a horizontal rotation limiting structure being provided on the support frame, and a vertical rotation limiting structure being provided on the connecting seat.

[0007] Preferably, a connecting column is vertically rotatably provided in the middle of the base, and the connecting seat is fixedly connected to the connecting column. The connecting seat and the base are respectively provided with connecting holes and threaded holes. The connecting holes and threaded holes are connected by limiting bolts, and the threaded holes are distributed at equal angles around the connecting column.

[0008] Preferably, the bottom end of the limiting bolt contacts the top of the mounting platform.

[0009] Preferably, the support frame is distributed on both sides of the axial flow fan. The support frame is a tripod structure. A connecting shell is fixedly installed at the top of the support frame. A worm gear and a worm are rotatably arranged inside the connecting shell. The worm and the worm gear are connected in a transmission. The axial flow fan is fixedly connected to the mounting shaft of the worm gear.

[0010] Preferably, the end of the worm gear is coaxially provided with an internal hexagonal connecting hole, and the size of the connecting hole is adapted to the size of the output head of the electric wrench.

[0011] Preferably, the middle part of the water supply pipe is fixed to the top of the mounting platform by a connecting buckle.

[0012] This utility model provides a device for improving the cooling rate of cast steel parts after heat treatment, which has the following beneficial effects.

[0013] By using an adjustable axial flow fan in conjunction with a water mist spraying structure to cool the cast steel parts on the heat treatment trolley, the air between the cast steel parts on the heat treatment trolley can be cooled and flowed more rapidly. This solves the problem of uneven cooling between the inner and outer layers of cast steel parts on the heat treatment trolley, improves mechanical properties, and subsequent testing of the cast steel parts revealed that the average strength of the cast steel parts increased by 20-40% and the impact energy increased by 50-80%. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0015] Figure 2 This is a cross-sectional view of the support frame in an embodiment of this utility model.

[0016] In the diagram: 1. Heat treatment trolley; 2. Mounting platform; 3. Base; 4. Connecting seat; 5. Support frame; 6. Connecting shell; 7. Axial flow fan; 8. Worm gear; 9. Limit bolt; 10. Water supply pipe; 11. Connecting buckle. Detailed Implementation

[0017] like Figure 1 and Figure 2 As shown, this utility model provides a device for improving the cooling rate of cast steel parts after heat treatment, including a heat treatment trolley 1, a mounting platform 2 connected to both sides of the heat treatment trolley 1, and an axial flow fan 7 arranged on the mounting platform 2. The axial flow fans 7 are equidistantly arranged on the mounting platform 2, and a sprayer is installed on the axial flow fan 7. The sprayer is connected to a water supply pipe 10. The axial flow fans 7 are mounted on a support assembly on the mounting platform 2. The support assembly can rotate vertically and horizontally.

[0018] Based on the number of heating zones in the gas-fired heat treatment furnace and the height at which the cast steel parts are placed on the heat treatment trolley 1, axial flow fans 7 and sprayers are fixed on the mounting platforms 2 on both sides of the heat treatment trolley 1. When the cast steel parts are air-cooled after heat treatment, the axial flow fans 7 and sprayers are turned on, so that water mist and cold air are blown upward at a 15° angle onto the cast steel parts. This achieves orderly upward airflow between the cast steel parts on the trolley, solves the problem of uneven cooling of the inner and outer layers of cast steel parts on the heat treatment trolley 1, accelerates the cooling speed of the cast steel parts, and improves the mechanical properties of the cast steel parts.

[0019] like Figure 1 and Figure 2 As shown. The support assembly includes a base 3 fixed on the mounting platform 2. A connecting seat 4 is vertically rotatably arranged on the top of the base 3, and a support frame 5 is fixed on the connecting seat 4. The axial flow fan 7 is horizontally rotatably connected to the top of the support frame 5 in the middle. The support frame 5 is provided with a horizontal rotation limiting structure, and the connecting seat 4 is provided with a vertical rotation limiting structure. The base 3 is directly installed on the mounting platform 2, and the connecting seat 4 is installed in a vertical state through the base 3. The connecting seat 4 can provide vertical rotation for the axial flow fan 7. The support frame 5 is fixed on the connecting seat 4, and the axial flow fan 7 is horizontally rotatably installed on the top of the support frame 5, realizing the horizontal rotation of the axial flow fan 7. Through rotation in both directions, the operator can adjust the output angle of the axial flow fan 7 to face the cast steel part.

[0020] The horizontal rotation limiting structure is used to fix the angle of the axial flow fan 7 in the horizontal rotation direction, and the vertical rotation limiting structure is used to fix the angle of the axial flow fan 7 in the vertical rotation direction.

[0021] like Figure 1 and Figure 2 As shown. A connecting column is vertically rotatably mounted in the center of the base 3, and the connecting seat 4 is fixedly connected to the connecting column. Connecting holes and threaded holes are respectively opened on the edges of the connecting seat 4 and the base 3. The connecting holes and threaded holes are connected by limiting bolts 9. The threaded holes are distributed at equal angles around the connecting column. Connecting holes are opened at the four quadrant points of the connecting seat 4, and no less than twelve threaded holes are opened on the base 3. By adjusting the alignment of the connecting holes with the threaded holes at different positions, and then connecting the connecting holes with the threaded holes by the limiting bolts 9, the vertical rotation of the connecting seat 4 can be limited.

[0022] like Figure 1 and Figure 2 As shown. The bottom end of the limiting bolt 9 contacts the top of the mounting platform 2. When the bottom end of the limiting bolt 9 contacts the top of the mounting platform 2, it can assist the connecting column in the middle of the base 3 in supporting the connecting seat 4, ensuring the stability of the connecting seat 4 during operation.

[0023] like Figure 1 and Figure 2As shown. The support frame 5 is distributed on both sides of the axial flow fan 7. The support frame 5 is a tripod structure. A connecting shell 6 is fixedly installed at the top of the support frame 5. A worm gear and a worm 8 are rotatably arranged inside the connecting shell 6, and the worm 8 is connected to the worm gear through a transmission. The axial flow fan 7 is fixedly connected to the mounting shaft of the worm gear. The support frame 5 is made of angle steel and has a tripod structure, providing stable support for the axial flow fan 7. By rotating the worm 8, the operator drives the worm gear meshing with it to rotate. During the rotation of the worm gear, the mounting shaft rotates, which in turn drives the axial flow fan 7 on the mounting shaft to rotate. Furthermore, the structure of the worm gear and worm 8 can achieve self-locking of the rotation angle of the axial flow fan 7.

[0024] As a preferred embodiment of this utility model, the end of the worm gear 8 is coaxially provided with an internal hexagonal connecting hole, and the size of the connecting hole is adapted to the size of the output head of the electric wrench. By providing a connecting hole at the end of the worm gear 8, the rotation speed of the worm wheel is increased by driving the worm gear 8 to rotate through the electric wrench, thereby facilitating the angle adjustment of the axial flow fan 7.

[0025] like Figure 1 As shown. The middle part of the water supply pipe 10 is fixed to the top of the mounting platform 2 by a connecting buckle 11. The connecting buckle 11 fixes the water supply pipe 10 to the mounting platform 2, preventing the water supply pipe 10 from being dragged and worn on the ground.

Claims

1. A device for increasing the cooling rate of cast steel parts after heat treatment, characterized in that: It includes a heat treatment trolley (1), an installation platform (2) connected to both sides of the heat treatment trolley (1), and an axial flow fan (7) arranged on the installation platform (2). The axial flow fans (7) are equidistantly arranged on the installation platform (2). A sprayer is installed on the axial flow fan (7), and the sprayer is connected to a water supply pipe (10). The axial flow fans (7) are installed on a support assembly on the installation platform (2), and the support assembly can rotate vertically and horizontally.

2. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 1, characterized in that: The support assembly includes a base (3) fixed on the mounting platform (2), a connecting seat (4) is vertically rotatably arranged on the top of the base (3), a support frame (5) is fixed on the connecting seat (4), the middle part of the axial flow fan (7) is horizontally rotatably connected to the top of the support frame (5), the support frame (5) is provided with a horizontal rotation limit structure, and the connecting seat (4) is provided with a vertical rotation limit structure.

3. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 2, characterized in that: The base (3) has a vertically rotating connecting column in the middle. The connecting seat (4) is fixedly connected to the connecting column. The connecting seat (4) and the base (3) have connecting holes and threaded holes respectively on their edges. The connecting holes and threaded holes are connected by limiting bolts (9). The threaded holes are distributed at equal angles around the connecting column.

4. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 3, characterized in that: The bottom end of the limiting bolt (9) contacts the top of the mounting platform (2).

5. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 2, characterized in that: The support frame (5) is distributed on both sides of the axial flow fan (7). The support frame (5) is a tripod structure. A connecting shell (6) is fixedly installed on the top of the support frame (5). A worm gear and a worm (8) are rotatably arranged inside the connecting shell (6). The worm (8) is connected to the worm gear in a transmission. The axial flow fan (7) is fixedly connected to the mounting shaft of the worm gear.

6. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 5, characterized in that: The end of the worm (8) is coaxially provided with an internal hexagonal connection hole, and the size of the connection hole is adapted to the size of the output head of the electric wrench.

7. The device for increasing the cooling rate of cast steel parts after heat treatment as described in claim 1, characterized in that: The middle part of the water supply pipe (10) is fixed to the top of the mounting platform (2) by a connecting buckle (11).

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