Quenching liquid circulating device for heat treatment of reinforcing steel bars

Abstract

The utility model discloses a reinforcing steel bar heat treatment quenching liquid circulating device which comprises a quenching tank, a liquid pumping pipe, a liquid return pipe and a circulating pipe, one part of the quenching tank is located on the ground, one end of the circulating pipe is connected with the upper end of the liquid pumping pipe, and the other end of the circulating pipe is connected with the upper end of the liquid return pipe. The other end of the liquid pumping pipe is located below the liquid level of quenching liquid in the quenching tank, and a circulating pump and a heat exchanger used for cooling extraction liquid are installed on the circulating pipe in series. According to the utility model, the problem of consistency caused by different performances of different batches of reinforcing steel bars after waste heat treatment is solved, and the stability of the performance of the reinforcing steel bars is improved.

Description

Technical Field

[0001] The utility model relates to steel bar production, in particular to a steel bar heat treatment quenching liquid circulation device. Background Art

[0002] With the rapid development of science and technology, on the one hand, the requirements for the performance of steel bars are getting higher and higher. Various engineering projects with complex functions and diverse shapes must use high-performance and high-strength steel bars; on the other hand, the requirements for the consistency of steel bars are also getting higher and higher. At present, the main technical approaches to develop high-performance steel bars are microalloying technology and residual heat treatment technology. The residual heat treatment process is a controlled cooling process. The hot-rolled steel piece is quenched to form a quenched martensite with a certain thickness on the surface of the steel bar, while the core is still austenite. Then the residual heat of the core diffuses to the surface, causing the martensite on the surface to self-temper, and at the same time, the austenite in the core transforms to ferrite or pearlite.

[0003] The existing residual heat treatment is to put the steel bars to be treated into a quenching tank for quenching. In the same quenching tank, different batches of steel bars are usually quenched. Since the steel bars are quenched in the quenching liquid, there is a large temperature difference between the temperature of the steel bars and the quenching liquid, and different batches of steel bars enter the quenching tank at different times, resulting in the quenching liquid temperature of the later batches being higher than that of the previous batch, resulting in different quenching conditions for different batches, which leads to different performances of different batches of steel bars after residual heat treatment and lack of consistency. Utility Model Content

[0004] In view of the above-mentioned defects, the utility model provides a steel bar heat treatment quenching liquid circulation device, which solves the consistency problem caused by different performances of different batches of steel bars after residual heat treatment and improves the stability of steel bar performance.

[0005] A steel bar heat treatment quenching liquid circulation device comprises a quenching tank, the steel bar heat treatment quenching liquid circulation device also comprises a liquid extraction pipe, a liquid return pipe and a circulation pipe, a part of the quenching tank is located on the ground, one end of the circulation pipe is connected to the upper end of the liquid extraction pipe, and the other end is connected to the upper end of the liquid return pipe, the other end of the liquid extraction pipe is located below the liquid level of the quenching liquid in the quenching tank, and a circulation pump and a heat exchanger for cooling the extraction liquid are installed in series on the circulation pipe.

[0006] In one or more optional embodiments of the present invention, a flow meter is further installed in series on the circulation pipe.

[0007] In one or more optional embodiments of the present invention, a first filter is also connected in series to the circulation pipe, and the first filter is located between the liquid extraction pipe and the circulation pump.

[0008] In one or more optional embodiments of the present invention, a second filter is connected in series to the circulation pipe, and the surface of the second filter in contact with the quenching liquid is a magnet surface.

[0009] In one or more optional embodiments of the present invention, a flocculation tank is also installed in series on the circulation pipe, the flocculation tank is located between the second filter and the heat exchanger, and a carbon removal agent pipe and a dilute acid pipe are connected to the flocculation tank.

[0010] In one or more optional embodiments of the present invention, the circulation pipe is further connected to a feed pipe, and the feed pipe is located between the heat exchanger and the liquid return pipe.

[0011] Beneficial effects of the invention: The utility model ensures that the steel bars processed in different batches have good consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0013] Figure 2 This is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0014] In the figure: 1. quenching tank, 2. liquid extraction pipe, 3. liquid return pipe, 4. circulation pipe, 5. ground, 6. circulation pump, 7. heat exchanger, 8. flow meter, 9. first filter, 10. second filter, 11. flocculation tank, 12. feed pipe. DETAILED DESCRIPTION

[0015] The utility model will be further described below.

[0016] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Example 1

[0019] Please refer to Figure 1 , Figure 1 It is a schematic diagram of the overall structure of this embodiment.

[0020] A steel bar heat treatment quenching liquid circulation device comprises a quenching tank 1, a liquid extraction pipe 2, a liquid return pipe 3 and a circulation pipe 4. A part of the quenching tank 1 is located on the ground 5, one end of the circulation pipe 4 is connected to the upper end of the liquid extraction pipe 2, and the other end is connected to the upper end of the liquid return pipe 3. The other end of the liquid extraction pipe 2 is located below the liquid level of the quenching liquid in the quenching tank 1. A circulation pump 6 and a heat exchanger 7 for cooling the extraction liquid are installed in series on the circulation pipe 4.

[0021] Through the arrangement of the heat exchanger 7 and the circulating pump 6, the quenching liquid extracted from the quenching tank 1 enters the heat exchanger 7 through the circulating pipe 4, cools, and then flows back to the quenching tank 1 from the return pipe 3, ensuring that different batches of steel bars are treated under the same heat treatment conditions. The cold mass is heated by the heat exchanger 7 and its temperature is increased, and it can be used in other processes of steel bar production or transported to other places outside the working area for use, making full use of energy.

[0022] In one or more specific embodiments of the present invention, a flow meter 8 is further installed in series on the circulation pipe 4 .

[0023] Those skilled in the art should know that they control the flow of the quenching liquid in the circulation pipe 4 and the flow of the cold mass in the heat exchanger 7 by controlling the valve (not shown) and the circulation pump 6. Ideally, the heat transferred to the quenching liquid by the quenching of the steel bars is carried out through the cold mass fluid in the heat exchanger 7, thereby maintaining a constant temperature of the quenching liquid in the quenching tank 1.

[0024] In one or more specific embodiments of the present invention, the lower end of the liquid extraction pipe 2 is located at the bottom of the quenching tank 1. At this time, the quenching liquid extracted from the liquid extraction pipe 2 is the bottom quenching liquid, which has a higher density and more impurities than the quenching liquid at other heights.

[0025] In one or more specific embodiments of the present invention, the liquid return pipe 3 is provided with a horizontal section and a vertical section, the end of the horizontal section away from the vertical section is connected to the circulation pipe 4, and the lower end of the vertical section is located in the upper layer of the quenching liquid in the quenching tank 1, thereby reducing the influence of the quenching liquid refluxed by the liquid return pipe 3 on the quenching liquid in the quenching tank 1.

[0026] Example 2

[0027] Although Example 1 solves the problem of maintaining a constant temperature of the quenching liquid, there is still room for further improvement.

[0028] Please refer to Figure 2 , Figure 2 It is a schematic diagram of the overall structure of this embodiment.

[0029] A steel bar heat treatment quenching liquid circulation device comprises a quenching tank 1, a liquid extraction pipe 2, a liquid return pipe 3 and a circulation pipe 4. A part of the quenching tank 1 is located on the ground 5. One end of the circulation pipe 4 is connected to the liquid extraction pipe 2, and the other end is connected to the liquid return pipe 3. The other end of the liquid extraction pipe 2 is located below the liquid level of the quenching liquid in the quenching tank 1. A circulation pump 6 and a heat exchanger 7 for cooling the extraction liquid are installed in series on the circulation pipe 4. A first filter 9 is also connected in series on the circulation pipe 4. The first filter 9 is located between the liquid extraction pipe 2 and the circulation pump 6.

[0030] Through the arrangement of the heat exchanger 7 and the circulating pump 6, the quenching liquid extracted from the quenching tank 1 enters the heat exchanger 7 through the circulating pipe 4, cools, and then flows back to the quenching tank 1 from the return pipe 3, ensuring that different batches of steel bars are treated under the same heat treatment conditions. The temperature of the cold mass increases after being heated by the heat exchanger 7, and it can be used for other processes of steel bar production or transported to other places outside the working area for use, making full use of energy. The first filter 9 filters out the particulate matter in the quenching liquid, thereby improving the quality of the quenching liquid on the one hand, and preventing the heat exchanger 7 from being blocked on the other hand.

[0031] In one or more specific embodiments of the present invention, the first filter 9 is a basket filter.

[0032] In one or more specific embodiments of the utility model, a second filter 10 is also connected in series on the circulation pipe 4, and the surface of the second filter 10 in contact with the quenching liquid is a magnet surface (the second filter 10 is a tube, and there is a magnet layer on the inner wall of the tube), which is used to filter the iron powder or iron particles in the quenching liquid that are not filtered by the first filter 9.

[0033] In one or more specific embodiments of the utility model, a flocculation tank 11 is also installed in series on the circulation pipe 4. The flocculation tank 11 is located between the second filter 10 and the heat exchanger 7. The flocculation tank 11 is connected with a decarbonizing agent pipe and a dilute acid pipe. The decarbonizing agent pipe and the dilute acid pipe introduce decarbonizing agent and dilute acid into the flocculation tank 11 to remove the carbon black and oxide scale remaining in the quenching liquid, so as to prevent the carbon black and oxide scale from absorbing the additives in the quenching liquid and accelerating the deterioration of the quenching liquid.

[0034] In one or more specific embodiments of the present invention, the circulation pipe 4 is further connected to a feeding pipe 12 , which is located between the heat exchanger 7 and the liquid return pipe 3 , and is used to replenish the loss of quenching liquid in the quenching tank 1 .

[0035] In one or more specific embodiments of the present invention, the lower end of the liquid extraction pipe 2 is located at the bottom of the quenching tank 1. At this time, the quenching liquid extracted from the liquid extraction pipe 2 is the bottom quenching liquid, which has a higher density and more impurities than the quenching liquid at other heights.

[0036] In one or more specific embodiments of the present invention, the liquid return pipe 3 is provided with a horizontal section and a vertical section, the end of the horizontal section away from the vertical section is connected to the circulation pipe 4, and the lower end of the vertical section is located in the upper layer of the quenching liquid in the quenching tank 1, thereby reducing the influence of the quenching liquid refluxed by the liquid return pipe 3 on the quenching liquid in the quenching tank 1.

[0037] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A steel bar heat treatment quenching liquid circulation device, comprising a quenching tank (1), characterized in that: The steel bar heat treatment quenching liquid circulation device also includes a liquid extraction pipe (2), a liquid return pipe (3) and a circulation pipe (4); a portion of the quenching tank (1) is located on the ground (5); one end of the circulation pipe (4) is connected to the upper end of the liquid extraction pipe (2), and the other end is connected to the upper end of the liquid return pipe (3); the other end of the liquid extraction pipe (2) is located below the liquid level of the quenching liquid in the quenching tank (1); and a circulation pump (6) and a heat exchanger (7) for cooling the quenching liquid are installed in series on the circulation pipe (4).

2. The steel bar heat treatment quenching liquid circulation device according to claim 1, characterized in that: The circulation pipe (4) is also provided with a flow meter (8) in series.

3. The steel bar heat treatment quenching liquid circulation device according to claim 1, characterized in that: The lower end of the liquid extraction pipe (2) is located at the bottom of the quenching tank (1).

4. The steel bar heat treatment quenching liquid circulation device according to claim 1, characterized in that: The liquid return pipe (3) is provided with a horizontal section and a vertical section, wherein one end of the horizontal section away from the vertical section is connected to the circulation pipe (4), and the lower end of the vertical section is located in the upper layer of the quenching liquid in the quenching tank (1).

5. The steel bar heat treatment quenching liquid circulation device according to any one of claims 1 to 4, characterized in that: The circulation pipe (4) is also connected in series with a first filter (9), and the first filter (9) is located between the liquid extraction pipe (2) and the circulation pump (6).

6. The steel bar heat treatment quenching liquid circulation device according to claim 5, characterized in that: The first filter (9) is a basket filter.

7. The steel bar heat treatment quenching liquid circulation device according to claim 6, characterized in that: The circulation pipe (4) is also connected in series with a second filter (10), and the surface of the second filter (10) in contact with the quenching liquid is a magnet surface.

8. The steel bar heat treatment quenching liquid circulation device according to claim 7, characterized in that: A flocculation tank (11) is also installed in series on the circulation pipe (4). The flocculation tank (11) is located between the second filter (10) and the heat exchanger (7). A carbon removal agent pipe and a dilute acid pipe are connected inside the flocculation tank (11).

9. The steel bar heat treatment quenching liquid circulation device according to claim 7, characterized in that: The circulation pipe (4) is also connected to a feed pipe (12), and the feed pipe (12) is located between the heat exchanger (7) and the liquid return pipe (3).

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