Controlled cooling device for outlet side pipe body of steel pipe heat treatment furnace

Abstract

The utility model relates to a steel pipe heat treatment furnace outlet side pipe body controlled cooling device, which belongs to the technical field of controlled cooling devices and comprises a temperature control device, one side of the temperature control device is connected with a turbid circulating water pipeline through a pipeline, the pipeline is sequentially provided with a pipeline pump, a pneumatic butterfly valve and a pressure gauge, and the other side of the temperature control device is provided with a water drainage device. Through the design of water pump and pneumatic butterfly valve control, seam spraying device superposition and the like, various different cold and temperature control treatments such as water cooling, water cooling and fog cooling, fog cooling and the like can be achieved. After the pipe body is normalized at 810-940 DEG C, the grain size can be effectively refined, the mechanical property can be improved, and the product percent of pass and the yield can be improved through cold-controlled and temperature-controlled accelerated cooling.

Description

Technical Field

[0001] The utility model relates to a cooling control device for a pipe body at the outlet side of a steel pipe heat treatment furnace, and belongs to the technical field of cooling control devices. Background Technology

[0002] At present, the heat treatment line in the heat treatment workshop is equipped with a steel pipe heating furnace, which can realize the normalizing heating treatment of seamless steel pipes of different materials and specifications. The heated pipes of different materials and different wall thicknesses have different cooling rates after leaving the furnace. The heated pipes are at high temperature for a long time, which may cause the ferrite grains of the pipes to grow, which has a great impact on the mechanical properties. Therefore, after heating, the pipe body is controlled to cool and the accelerated cooling process is combined to reduce the phase transformation temperature and further refine the ferrite and pearlite structures. When the cooling rate reaches a certain value, the phase transformation structure that may be obtained will change from ferrite and pearlite structures to finer ferrite and bainite structures. The amount of bainite will increase with the acceleration of the cooling rate, and the generated bainite structure will be extremely fine, thereby further enhancing the strength of the pipe body. Therefore, as long as the accelerated cooling process is reasonably selected, grain refinement can be achieved, the brittle transition temperature can be reduced, and the tensile and impact properties of the pipe body can be further improved.

[0003] The existing steel pipe cooling devices include four-sided or circumferential fixed water nozzle spray cooling, spray cooling implemented on the cooling bed, fan cooling, etc. The four-sided or circumferential fixed water nozzle spray cooling technology requires the customization of different numbers of nozzle spray rings for different pipe diameter ranges. The device is complicated, and the fixed water nozzle spray cooling is easy to cause uneven circumferential temperature drop of the pipe body and unstable performance. The spray cooling or fan cooling technology implemented on the cooling bed is also easy to cause uneven temperature drop between the two ends and the middle of the pipe body or uneven temperature drop on the positive and negative sides of the pipe body, resulting in unstable pipe performance and high defective product rate. SUMMARY OF THE INVENTION

[0004] The purpose of this utility model is to overcome the shortcomings of the above-mentioned traditional technology and provide a pipe body cooling control device at the outlet side of a steel pipe heat treatment furnace. The design of water pump, pneumatic butterfly valve control and spraying device superposition can realize a variety of different cooling and temperature control treatments such as water cooling, water cooling + mist cooling, and mist cooling. After the pipe body is normalized at 810-940℃, the accelerated cooling of cooling and temperature control can effectively refine the grain size, improve the mechanical properties, and improve the product qualification rate and yield rate.

[0005] The purpose of the utility model is achieved through the following technical measures: a cooling device for the pipe body at the outlet side of a steel pipe heat treatment furnace, including a temperature control device, one side of the temperature control device is connected to a turbid circulating water pipeline through a pipeline, and a pipeline pump, a pneumatic butterfly valve, and a pressure gauge are arranged on the pipeline in sequence, and a water discharge device is arranged on the other side of the temperature control device.

[0006] As a further improvement of the above technical solution:

[0007] The temperature control device includes a water jacket housing which is circular ring-shaped. An annular water jacket is provided inside the water jacket housing, and there is a gap between the water jacket and the water jacket housing. The water jacket is composed of a number of water jacket rings arranged side by side, and the water jacket ring includes a first water jacket inner liner and a second water jacket inner liner.

[0008] Both the first water jacket inner liner and the second water jacket inner liner are circular ring-shaped. The width of the outer end face of the first water jacket inner liner and the second water jacket inner liner is smaller than that of the inner end face. A third water jacket inner liner is provided between the outer end faces of the first water jacket inner liner and the second water jacket inner liner.

[0009] Copper gaskets are respectively provided between the third water jacket inner liner and the first water jacket inner liner, and between the third water jacket inner liner and the second water jacket inner liner.

[0010] The third water jacket inner liner is respectively fixedly connected to the first water jacket inner liner and the second water jacket inner liner by screws.

[0011] The first water jacket inner liner, the second water jacket inner liner, and the third water jacket inner liner form a cavity, and a water inlet is provided at the center of the third water jacket inner liner.

[0012] One side below of the first water jacket inner liner close to the second water jacket inner liner has a first inclined portion, and one side below of the second water jacket inner liner close to the first water jacket inner liner has a second inclined portion. The first inclined portion and the second inclined portion are opposite to form a spray slot, and the spray slot is located below the water inlet.

[0013] The included angle between the center line of the water inlet and the centripetal line of the water jacket axis of the same cross-section is 7.2°, and the width of the spray slot is 0.2 mm.

[0014] A front end cover and a rear end cover are respectively connected to both sides of the water jacket housing. First non-asbestos water seal gaskets are respectively provided between the water jacket housing and the front end cover, and between the water jacket housing and the rear end cover. Annular bosses are respectively provided on the front end cover and the rear end cover, and the water jacket housing is arranged on the bosses. A first O-ring is provided between the water jacket housing and the bosses.

[0015] Second non-asbestos water seal gaskets are respectively provided between the water jacket and the front end cover, and between the water jacket and the rear end cover. Grooves are respectively provided on the inner sides of the front end cover and the rear end cover, and the second non-asbestos water seal gaskets are arranged in the grooves. Second O-rings are provided between adjacent water jacket rings. Through holes with the same inner diameter as the water jacket are respectively provided on the front end cover and the rear end cover.

[0016] Due to the adoption of the above technical solution, compared with the prior art, the advantages of the present utility model are as follows: on the outlet side of the normalizing furnace, a temperature control device with a pneumatic butterfly valve for flow control is provided. This device adopts an annular eccentric spray slot assembly, and an appropriate number of water jacket rings are selected and arranged in combination according to the temperature control requirements. Combining a pipeline pump and a pneumatic butterfly valve to control the water inlet flow rate and pipeline pressure, rapid cooling and temperature control treatment are carried out on the heated pipe body on the outlet side of the heat treatment furnace, achieving the purpose of improving the crystal grain size of the pipe body and enhancing the mechanical properties. Accelerated cooling and temperature control are realized for heated steel pipes with different specifications and materials, reducing the phase transformation temperature, further refining the ferrite and pearlite structures, and improving the strength and mechanical property stability of the pipe body.

[0017] Flow control components such as a pipeline pump, a pneumatic butterfly valve, and a pressure gauge are arranged on the inlet side of the device, which can achieve pipeline flow rate changes of 25%, 50%, 75%, 100% or more, and realize cooling combinations such as spray slot water spraying, water spraying + spraying, and spraying. By selecting an appropriate number of water jacket rings, single spray slot or multiple spray slot superimposed spray cooling can be achieved, so that heated pipe bodies with different materials and wall thicknesses can realize grain refinement of the pipe body, reduction of the brittle transition temperature, and further improvement of the tensile and impact properties of the pipe body by reasonably selecting the accelerated cooling process.

[0018] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a pipe body cooling control device on the outlet side of a steel pipe heat treatment furnace in an embodiment of the present utility model;

[0020] Figure 2 It is a three-dimensional structural diagram of the temperature control device in an embodiment of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of the temperature control device in an embodiment of the present utility model;

[0022] Figure 4 It is Figure 1 the left view of;

[0023] Figure 5 It is Figure 4 the sectional structural diagram in the K-K direction of;

[0024] Figure 6 It is Figure 3 the sectional structural diagram in the A-A direction of;

[0025] Figure 7 It is Figure 6 the partial enlarged view of part B in;

[0026] Figure 8Schematic three-dimensional structure diagram of the tube body control cooling device on the outlet side of a steel pipe heat treatment furnace in an embodiment of the present invention after removing the water jacket housing and flange;

[0027] Figure 9 Schematic installation structure diagram of the water inlet of a tube body control cooling device on the outlet side of a steel pipe heat treatment furnace in an embodiment of the present invention at the same cross-section of the water jacket.

[0028] In the figure, 1 - pipeline pump, 2 - pneumatic butterfly valve, 3 - pressure gauge, 4 - temperature control device, 5 - drain device, 6 - water jacket housing, 7 - water jacket, 8 - gap, 9 - water jacket ring, 10 - first water jacket inner liner, 11 - second water jacket inner liner, 12 - third water jacket inner liner, 13 - copper gasket, 14 - screw, 15 - water inlet, 16 - first inclined part, 17 - second inclined part, 18 - spray slot, 19 - front end cover, 20 - rear end cover, 21 - first non-asbestos water seal gasket, 22 - boss, 23 - first O-ring, 24 - second non-asbestos water seal gasket, 25 - clamping groove, 26 - second O-ring, 27 - flange, 28 - pipeline, 29 - dirty circulating water pipeline, 30 - through hole, 31 - cavity. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined. Embodiment

[0032] As shown Figures 1-9 in the figure, a tube body controlled cooling device on the outlet side of a steel pipe heat treatment furnace includes a temperature control device 4. One side of the temperature control device 4 is connected to a turbidity circulating water pipe 29 through a pipe 28. A pipe pump 1, a pneumatic butterfly valve 2, and a pressure gauge 3 are successively arranged on the pipe 28. A drain device 5 is arranged on the other side of the temperature control device 4.

[0033] The temperature control device 4 includes a water jacket housing 6. The water jacket housing 6 is circular. An annular water jacket 7 is arranged inside the water jacket housing 6. There is a gap 8 between the water jacket 7 and the water jacket housing 6. The water jacket 7 is composed of several water jacket rings 9 arranged side by side. In this embodiment, there are five. The water jacket ring 9 is circular. The width of the water jacket ring 9 is 100 mm. The water jacket ring 9 includes a first water jacket inner liner 10 and a second water jacket inner liner 11. Both the first water jacket inner liner 10 and the second water jacket inner liner 11 are circular. The outer end face width of the first water jacket inner liner 10 and the second water jacket inner liner 11 is smaller than the inner end face width. A third water jacket inner liner 12 is arranged between the outer end faces of the first water jacket inner liner 10 and the second water jacket inner liner 11. Copper gaskets 13 are respectively arranged between the third water jacket inner liner 12 and the first water jacket inner liner 10, and the third water jacket inner liner 12 and the second water jacket inner liner 11. The third water jacket inner liner 12 is fixedly connected to the first water jacket inner liner 10 and the second water jacket inner liner 11 through screws 14 respectively.

[0034] The first water jacket inner liner 10, the second water jacket inner liner 11, and the third water jacket inner liner 12 form a cavity 31. A water inlet 15 is arranged at the center of the third water jacket inner liner 12. A first inclined portion 16 is provided below the side of the first water jacket inner liner 10 close to the second water jacket inner liner 11. A second inclined portion 17 is provided below the side of the second water jacket inner liner 11 close to the first water jacket inner liner 10. The first inclined portion 16 and the second inclined portion 17 are opposite to form a spray slit 18. The spray slit 18 is located below the water inlet 15. The width of the spray slit 18 is 0.2 mm. The width of the spray slit 18 can be adjusted by adjusting the thickness of the copper gasket 13. Multiple different controlled cooling and temperature control treatments such as water cooling, water cooling + fog cooling, and fog cooling can be realized under certain pressures and different flow rates; the included angle between the center line of the water inlet 15 and the centripetal line of the water jacket axis of the same cross-section is 7.2°, as Figure 8 shown in the figure, so that the sprayed water flow is eccentrically arranged, the refrigeration is more uniform, the tube body performance is more stable, and problems such as reducing the defective product rate are reduced.

[0035] Front end covers 19 and rear end covers 20 are respectively connected to both sides of the water jacket housing 6. First non-asbestos water seal gaskets 21 are respectively arranged between the water jacket housing 6 and the front end covers 19 and the rear end covers 20. Annular bosses 22 are respectively arranged on the front end covers 19 and the rear end covers 20. The water jacket housing 6 is arranged on the bosses 22. A first O-ring 23 is arranged between the water jacket housing 6 and the bosses 22.

[0036] A second non-asbestos water seal gasket 24 is respectively provided between the water jacket 7 and the front end cover 19 and the rear end cover 20. Clamping grooves 25 are respectively provided on the inner sides of the front end cover 19 and the rear end cover 20. The second non-asbestos water seal gasket 24 is arranged in the clamping grooves 25. A second O-ring seal 26 is provided between adjacent water jacket rings 9. Through holes 30 with the same inner diameter as the water jacket 7 are respectively provided on the front end cover 19 and the rear end cover 20.

[0037] Flanges 27 are respectively provided on the upper and lower sides of the water jacket housing 6.

[0038] The dirty loop water in the dirty loop water pipeline is pumped in through the pipeline pump 1, and the pressure is controlled at 0.2 - 0.4 Mpa. The pneumatic butterfly valve 2 controls different water flow rates to enter the temperature control device 4. The water temperature is ≤ 40 °C, and the flow rate is ≥ 50 m³ / h - 250 m³ / h. Various different cooling and temperature control treatments such as water cooling, water cooling + fog cooling, and fog cooling are realized under certain pressures and different flow rates. The temperature control device 4 can increase or decrease the number of spray slots 18, thereby increasing or decreasing the cooling passes of the pipe body cross-section, and further realizing the control of the cooling speed. The maximum cooling speed is 200 °C / s. The water discharged from the temperature control device 4 returns to the dirty loop water pipeline through the drain device 5 and is recycled after water treatment.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipe cooling control device at the outlet side of a steel pipe heat treatment furnace, characterized in that: It comprises a temperature control device (4), one side of the temperature control device (4) is connected to a turbid circulating water pipeline (29) via a pipeline (28), a pipeline pump (1), a pneumatic butterfly valve (2), and a pressure gauge (3) are sequentially provided on the pipeline (28), and the other side of the temperature control device (4) is provided with a water discharge device (5); The temperature control device (4) comprises a water jacket outer shell (6), the water jacket outer shell (6) is annular, an annular water jacket (7) is arranged inside the water jacket outer shell (6), a gap (8) is provided between the water jacket (7) and the water jacket outer shell (6), the water jacket (7) is composed of a plurality of water jacket rings (9) arranged side by side, and the water jacket rings (9) comprise a first water jacket inner liner (10) and a second water jacket inner liner (11).

2. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 1, characterized in that: The first water jacket liner (10) and the second water jacket liner (11) are both annular, the width of the outer end faces of the first water jacket liner (10) and the second water jacket liner (11) are smaller than the width of the inner end faces, and a third water jacket liner (12) is provided between the outer end faces of the first water jacket liner (10) and the second water jacket liner (11).

3. The cooling control device for the pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 2, characterized in that: Copper gaskets (13) are respectively provided between the third water jacket inner liner (12) and the first water jacket inner liner (10) and the second water jacket inner liner (11).

4. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 3, characterized in that: The third water jacket inner liner (12) is fixedly connected to the first water jacket inner liner (10) and the second water jacket inner liner (11) respectively by means of screws (14).

5. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 4, characterized in that: The first water jacket inner liner (10), the second water jacket inner liner (11), and the third water jacket inner liner (12) form a cavity (31), and a water inlet (15) is provided at the center of the third water jacket inner liner (12).

6. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 5, characterized in that: The first water jacket inner liner (10) has a first inclined portion (16) below a side close to the second water jacket inner liner (11), and the second water jacket inner liner (11) has a second inclined portion (17) below a side close to the first water jacket inner liner (10). The first inclined portion (16) and the second inclined portion (17) are opposed to each other to form a spray seam (18), and the spray seam (18) is located below the water inlet (15).

7. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 6, characterized in that: The included angle between the center line of the water inlet (15) and the centripetal line of the water jacket axis in the same cross section is 7.2°, and the width of the spray slot (18) is 0.2 mm.

8. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 7, characterized in that: The water jacket shell (6) is connected to a front end cover (19) and a rear end cover (20) on both sides, respectively; a first asbestos-free water seal gasket (21) is provided between the water jacket shell (6) and the front end cover (19) and the rear end cover (20), respectively; an annular boss (22) is provided on the front end cover (19) and the rear end cover (20), respectively; the water jacket shell (6) is arranged on the boss (22), and a first O-ring (23) is provided between the water jacket shell (6) and the boss (22).

9. The device for controlling cooling of a pipe body at the outlet side of a steel pipe heat treatment furnace according to claim 8, characterized in that: A second asbestos-free water seal gasket (24) is provided between the water jacket (7) and the front end cover (19) and the rear end cover (20), respectively; a clamping groove (25) is provided on the inner side of the front end cover (19) and the rear end cover (20), respectively; the second asbestos-free water seal gasket (24) is arranged in the clamping groove (25); a second O-ring (26) is provided between adjacent water jacket rings (9); and a through hole (30) having the same inner diameter as the water jacket (7) is provided on the front end cover (19) and the rear end cover (20).

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