Experimental device for simulating pressure type quenching cooling of steel plate

Abstract

The utility model relates to the technical field of quenching, in particular to an experimental device for simulating pressure type quenching cooling of a steel plate. In particular to an experimental device for simulating rolling quenching cooling in industrial production of steel plates. The experimental device for simulating the pressure type quenching cooling of the steel plate comprises a high-pressure water single-side strong jet cooling system, and the high-pressure water single-side strong jet cooling system comprises a nozzle system; the nozzle system comprises a nozzle disc, a guide polish rod and a driving motor; the nozzle disc is arranged on a guide polish rod in a sleeving mode, and one end of the guide polish rod is connected with an output shaft of the driving motor. According to the device, the instantaneous comprehensive cooling of the sample steel plate is realized, the same quenching effect of industrial production is realized, and the effect of simulating the pressure type quenching process of the steel plate with the length of 200-300mm, the width of 150-250mm and the thickness of 20-120mm, especially the steel plate with the thickness of 40-100mm under the off-line working condition can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of quenching, in particular to an experimental device for simulating pressure-type quenching cooling of steel plates. Background Art

[0002] Quenching is a common process in the heat treatment process of steel. For the quenching of industrial steel plates, the most common method is to use high-pressure water for quenching. The roller quenching machine is a machine that conveys steel plates through rollers in industrial production and enters the water spraying area for quenching. The steel plates are quenched while moving. One of the characteristics of roller quenching is that it first uses a suitable amount of water to absorb the heat on the surface of the steel plate to the maximum extent to quickly cool it, maintain the same cooling rate on the upper and lower surfaces of the steel plate, and avoid warping and deformation. Then, the steel plate is cooled with a large amount of water, and the temperature of the steel plate is finally reduced to room temperature. The roller quenching method has become the mainstream process for quenching medium and thick steel plates due to its advantages such as high maximum cooling rate, wide adjustable cooling rate range, high cooling uniformity and good flatness of steel plate products. In industrial production, roller quenching usually adopts the method of uniform movement of steel plates and double-sided high-pressure water spray cooling to obtain uniform high cooling rate conditions in the two-dimensional direction of the plate surface. The cooling rate of the upper and lower surfaces of the steel plate is also consistent due to the adjustable quantitative industrial quenching water spray.

[0003] Under laboratory research conditions, due to limited space and capital investment, the methods of unidirectional movement of the sample and double-sided high-pressure water jet cooling are not feasible. The existing experimental devices for simulating roller quenching cooling of steel plates have the following problems: 1) The cooling speed of the upper and lower surfaces of the steel plate is inconsistent; 2) The cooling speed of the steel plate surface is uneven; 3) The cooling rate adjustment range of the steel plate is limited; 4) The quantitative monitoring effect of the cooling rate path and speed of the steel plate is not good. In order to improve the effect of laboratory devices simulating the pressure quenching process of steel plates in industrial production and enhance the guiding significance for industrial production, the commonly used improvement measures include using thinner steel plates for water tank quenching and thermocouple real-time temperature measurement, but they still cannot effectively improve the effect of industrial simulation of laboratory devices. Utility Model Content

[0004] In view of the above analysis, the utility model discloses an experimental device for simulating pressure quenching cooling of steel plates, which is applied to the pressure quenching process simulation of small sample steel plates under offline working conditions in laboratory scale.

[0005] The utility model is mainly realized through the following technical solutions:

[0006] An experimental device for simulating pressure quenching cooling of steel plates, comprising a high-pressure water single-sided strong jet cooling system, wherein the high-pressure water single-sided strong jet cooling system comprises a nozzle system;

[0007] The nozzle system comprises a nozzle plate, a guide light rod and a drive motor;

[0008] The nozzle disc is sleeved on the guide light rod, and one end of the guide light rod is connected to the output shaft of the driving motor.

[0009] Furthermore, the nozzle system further comprises a nozzle reciprocating mechanism, the nozzle plate is fixed above the nozzle reciprocating mechanism, and the lower part of the nozzle reciprocating mechanism is sleeved on the guide light rod.

[0010] Furthermore, the nozzle plate is provided with multiple rows of nozzles, and each row is evenly provided with 6 to 7 nozzles.

[0011] Furthermore, the row spacing between the multiple rows of nozzles is 25-28 mm, and the nozzle spacing in the same row is the same as the row spacing between the multiple rows of nozzles.

[0012] Furthermore, the centers of adjacent nozzles in adjacent rows are staggered.

[0013] Furthermore, the nozzle adopts a fan-shaped water outlet mode.

[0014] Furthermore, the nozzle reciprocating mechanism includes a height adjustment mechanism, the nozzle plate is arranged on the height adjustment device, and the nozzle height is adjusted by the height adjustment mechanism.

[0015] Furthermore, the high-pressure water single-sided strong jet cooling system also includes a spray water barrier and a drainage ditch. The bottom of the spray water barrier is connected to the drainage ditch, and the sprayed cooling water is discharged from the drainage ditch.

[0016] Furthermore, the experimental device also includes an electric heating furnace and a sample transmission system, and the sample is lifted into or out of the electric heating furnace through the sample transmission system.

[0017] Furthermore, the electric heating furnace is open at the top, and a furnace door positioning device is provided on the furnace top.

[0018] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0019] 1) Under the offline working condition where the sample does not move, the nozzle position layout, nozzle movement path and speed control of the high-pressure water single-sided strong jet cooling system are adopted. The nozzle reciprocates in a straight line along the horizontal and vertical directions on a certain thickness plane of the sample, which can achieve instantaneous and / or full coverage spraying of the spray surface of the sample steel plate, simulating the cooling of the steel plate surface.

[0020] 2) It can be applied to steel plates with a size range of 200-300mm in length, 150-250mm in width, and a thickness of 20-120mm, especially 40-100mm in thickness. It can effectively solve the problems of difficult quality stability control and large differences in cross-sectional characteristics in the scientific research process of thick steel plates, and fill the gap in laboratory simulation devices in the field of thick steel plate quenching. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0022] Figure 1 It is a schematic diagram of the nozzle system structure;

[0023] Figure 2 This is a schematic diagram of the nozzle arrangement;

[0024] Figure 3 Schematic diagram of the sample steel plate;

[0025] Figure 4 is the sample heating curve of Example 1;

[0026] Figure 5 This is the cooling curve of the sample in Example 1.

[0027] Reference numerals:

[0028] 1-nozzle pipe; 2-guide light rod; 3, spray water barrier box; 4-observation window; 5-sample hoisting furnace door; 6-sample cradle; 7-test; 8-nozzle plate; 9-nozzle reciprocating mechanism; 10-drive motor; 11-motion screw; 12-proximity sensor;

[0029] BB-nozzle movement direction;

[0030] a-insulated end of the sample; b-middle end of the sample; c-cooled end of the sample; d-middle of the sample; e-1 / 4 of the sample; f-edge of the sample. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0032] An experimental device for simulating pressure quenching cooling of steel plates, comprising a high-pressure water single-sided strong jet cooling system, wherein the high-pressure water single-sided strong jet cooling system comprises a nozzle system;

[0033] The nozzle system comprises a nozzle plate, a guide light rod and a drive motor;

[0034] The nozzle disc is sleeved on the guide light rod, and one end of the guide light rod is connected to the output shaft of the driving motor.

[0035] Specifically, the nozzle system further includes a nozzle reciprocating mechanism, the nozzle plate is fixed above the nozzle reciprocating mechanism, and the lower part of the nozzle reciprocating mechanism is sleeved on the guide light rod.

[0036] In a possible implementation, Figure 1 As shown, the nozzle system consists of a nozzle plate, a nozzle reciprocating mechanism, a guide light rod, and a drive motor.

[0037] Specifically, the nozzle reciprocating mechanism is directly connected to the nozzle, and the driving motor provides power to the reciprocating mechanism through the guide light rod.

[0038] Specifically, the nozzle plate is provided with multiple rows of nozzles, and each row is evenly provided with 6 to 7 nozzles.

[0039] Specifically, the row spacing between the multiple rows of nozzles is 25-28 mm, and the nozzle spacing in the same row is the same as the row spacing between the multiple rows of nozzles.

[0040] Specifically, the centers of adjacent nozzles in adjacent rows are staggered.

[0041] In a possible implementation, Figure 2 As shown, the nozzle plate is composed of three rows of nozzles (row A, row B and row C). For example, the row spacing of the nozzles is 27 mm, each row has 6 to 7 nozzles, and the spacing of the nozzles in each row is 27 mm. The nozzles in row B are arranged offset relative to the center of the corresponding nozzles in row A, and the spacing between a certain nozzle in row B and its two adjacent nozzles in row A on the left and right is equal. Similarly, the nozzles in row C are arranged offset relative to the nozzles in row B in the same direction, and the spacing between a certain nozzle in row B and its two adjacent nozzles in row C on the left and right is equal.

[0042] Furthermore, the nozzle adopts a fan-shaped water outlet mode.

[0043] The staggered arrangement of the three rows of nozzle plates and the fan-shaped water discharge pattern of a single nozzle ensure that the spray surface of the sample steel plate is completely covered without blind areas.

[0044] Furthermore, the nozzle reciprocating mechanism includes a height adjustment mechanism, the nozzle plate is arranged on the height adjustment device, and the nozzle height is adjusted by the height adjustment mechanism.

[0045] It can be understood that the nozzle height is controlled by the height adjustment mechanism and the reciprocating linear movement of the nozzle on the horizontal plane is achieved by the reciprocating mechanism. When the pressure, temperature, flow rate and injection cooling time of the high-pressure water in the high-pressure water single-sided intensive jet cooling system are controllable, the cooling rate of the steel plate can be continuously adjusted by adjusting the process parameters such as the pressure, temperature, flow rate and injection cooling time of the high-pressure water in the high-pressure water single-sided intensive jet cooling system, ultimately achieving instantaneous uniform coverage of the sample and controlling the cooling rate.

[0046] Furthermore, the high-pressure water single-sided strong jet cooling system also includes a spray water barrier and a drainage ditch. The bottom of the spray water barrier is connected to the drainage ditch, and the sprayed cooling water is discharged from the drainage ditch.

[0047] Furthermore, the experimental device also includes an electric heating furnace and a sample transmission system, and the sample is lifted into or out of the electric heating furnace through the sample transmission system.

[0048] Specifically, the sample transmission system uses manual settings and robotic arm assistance to control the movement of the hoisting furnace door.

[0049] An electric heating furnace is used as the heating system. The heating furnace door is set to open from the top, and a furnace door positioning device is provided on the top of the heating furnace.

[0050] Specifically, the sample hoisting furnace door of the electric heating furnace consists of a furnace door top cover, sample upper insulation, sample side insulation, and a furnace door. It is made of 2520 stainless steel and has an overall weight of 100 to 150 kg.

[0051] Furthermore, the electric heating furnace is open at the top, and a furnace door positioning device is provided on the furnace top.

[0052] The laboratory device of the present invention also includes a control terminal, which adjusts the process parameters such as the pressure, temperature, flow rate, and injection cooling time of the high-pressure water in the single-sided high-pressure water jet cooling system through the control terminal instructions, thereby achieving continuous adjustment of the cooling rate of the steel plate, and ultimately achieving instantaneous uniform coverage of the sample and controlling the cooling rate.

[0053] Specifically, a programmable controller can be used as a control terminal platform, and the control action can be realized through the servo system in an electric or pneumatic transmission mode, ultimately achieving the effect of inputting process parameters through the HMI manual interface and automatic operation of the experimental device single equipment / the entire device, especially the controllable path and speed of the nozzle movement.

[0054] In addition, the nozzle position, nozzle path, and temperature of each thermocouple position of the sample can be collected, stored, displayed, and counted. The control terminal can be used to calculate the real-time cooling rate, average cooling rate, and other data of the sample, and a data change curve can be drawn to characterize the process changes of sample cooling.

[0055] Specifically, the experimental device of the utility model is suitable for steel plates with a length of 200-300 mm, a width of 150-250 mm, and a thickness of 20-120 mm, especially a steel plate with a thickness of 40-100 mm.

[0056] Application Examples

[0057] The sample used in this embodiment is a steel plate with a size of 220*200 mm and a thickness of 60 mm.

[0058] The experimental device for simulating pressure quenching cooling of steel plates as shown in the figure includes a heating system, a sample transmission system, a high-pressure water single-sided strong jet cooling system, and a control system.

[0059] The heating system uses an electric heating furnace, and the furnace door is set to open from the top. The sample hoisting furnace door of the heating furnace consists of the furnace door top cover, sample upper insulation, sample side insulation, and furnace door. The material is 2520 stainless steel, and the overall weight is 110kg. The target temperature for sample heating is set to 900℃.

[0060] The sample transmission system uses manual control and mechanical arm power assistance to move the hoisting furnace door.

[0061] The furnace door positioning device is installed on the top of the heating furnace and the top of the spray system. The furnace door can be quickly moved to the heating and cooling positions manually. The sample hoisting furnace door lowers the sample from the top to the furnace to heat the sample; the sample hoisting furnace door moves the sample horizontally from the furnace to the cooling position to quench and cool the sample.

[0062] High-pressure water single-sided strong jet cooling system: includes spray water barrier box, nozzle system and drainage ditch.

[0063] The spray water barrier provides the nozzle system with other surfaces outside the spraying surface, eliminating the influence of the sprayed cooling water on the nozzle system. The bottom of the spray water barrier is connected to the drainage ditch, and the sprayed cooling water is discharged from the drainage ditch.

[0064] The nozzle system consists of a nozzle plate, a nozzle reciprocating mechanism, a guide light rod, and a drive motor. The nozzle reciprocating mechanism is directly connected to the nozzle, and the drive motor provides power to the reciprocating mechanism through the guide light rod.

[0065] like Figure 2 As shown, the nozzle plate is arranged in three rows of ABC, with 6 to 7 nozzles in each row, the spacing between the nozzles in each row is 27mm, the row B nozzles are staggered relative to the center of the corresponding nozzles in row A, and the distance between the nozzles in row B and the adjacent nozzles in row A is 9mm. Similarly, the nozzles in row C are staggered in the same direction relative to the nozzles in row B. A single nozzle adopts a fan-shaped water discharge mode.

[0066] The pressure of high-pressure water is 0.7MPa, the opening is 30%, the water temperature is 15℃, and the cooling time is 20min.

[0067] The sample heating and cooling temperature curves of this experimental device show that:

[0068] 1) When the heating target temperature is set at 900°C, the heating curves at different positions on the same thickness plane of the sample remain consistent, indicating that the heating speed of the sample is consistent in the axial direction of the thickness. The experimental device of the utility model achieves the effect of uniform heating of the sample;

[0069] 2) During the cooling process of the sample, the cooling rate at the cooling end of the steel plate shall not be less than 5℃ / s.

[0070] 3) The cooling curves at different positions on the same thickness plane of the sample are basically overlapped, indicating that the cooling rate of the sample is consistent in the plane direction of the thickness. The experimental device of the utility model achieves the effect of uniform cooling of the sample.

[0071] The sample heating curve drawn by analyzing the experimental data of Example 1 Figure 4 , sample cooling curve Figure 5 It can be characterized that unidirectional cooling of the steel plate from the strong cooling end along the thickness direction of the steel plate is achieved, and the cooling rate and cooling temperature field distribution are consistent with the cooling rate and cooling temperature field distribution of the surface (strong jet surface) and core (insulating surface of the steel plate) of the sample in the industrial quenching process, thereby realizing the guiding significance of the scientific research results of this experimental device for the quenching of industrial thick steel plates.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. An experimental device for simulating pressure quenching cooling of steel plates, characterized in that: It includes a high-pressure water single-sided strong jet cooling system, and the high-pressure water single-sided strong jet cooling system includes a nozzle system; The nozzle system comprises a nozzle plate, a guide light rod and a drive motor; The nozzle disc is sleeved on the guide light rod, and one end of the guide light rod is connected to the output shaft of the driving motor.

2. The experimental device for simulating pressure quenching cooling of steel plates according to claim 1, characterized in that: The nozzle system also includes a nozzle reciprocating mechanism, the nozzle plate is fixed above the nozzle reciprocating mechanism, and the lower part of the nozzle reciprocating mechanism is sleeved on the guide light rod.

3. The experimental device for simulating pressure quenching cooling of steel plates according to claim 2, characterized in that: The nozzle plate is provided with multiple rows of nozzles, and each row is evenly provided with 6 to 7 nozzles.

4. The experimental device for simulating pressure quenching cooling of steel plates according to claim 3, characterized in that: The row spacing of the multiple rows of nozzles is 25-28 mm, and the nozzle spacing in the same row is the same as the row spacing of the multiple rows of nozzles.

5. The experimental device for simulating pressure quenching cooling of steel plates according to claim 3, characterized in that: The centers of adjacent nozzles in adjacent rows are staggered.

6. The experimental device for simulating pressure quenching cooling of steel plates according to claim 3, characterized in that: The nozzle adopts a fan-shaped water outlet mode.

7. The experimental device for simulating pressure quenching cooling of steel plates according to claim 3, characterized in that: The nozzle reciprocating mechanism comprises a height adjusting mechanism, the nozzle plate is arranged on the height adjusting mechanism, and the nozzle height is adjusted by the height adjusting mechanism.

8. An experimental device for simulating pressure quenching cooling of steel plates according to any one of claims 1 to 7, characterized in that: The high-pressure water single-sided strong jet cooling system also includes a spray water barrier box and a drainage ditch. The bottom of the spray water barrier box is connected to the drainage ditch, and the sprayed cooling water is discharged from the drainage ditch.

9. The experimental device for simulating pressure quenching cooling of steel plates according to claim 8, characterized in that: The experimental device also includes an electric heating furnace and a sample transmission system, and the sample is lifted into or lifted out of the electric heating furnace through the sample transmission system.

10. The experimental device for simulating pressure quenching cooling of steel plates according to claim 9, characterized in that: The electric heating furnace is open at the top, and a furnace door positioning device is arranged on the furnace top.

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