Device and method for improving strip quenching performance

Abstract

The present invention relates to a device and method for improving the quenching performance of strips, comprising an air cushion furnace with a heating section and a cooling section, wherein a light curtain and a laser rangefinder are arranged between the heating section and the cooling section in the air cushion furnace, wherein a plurality of pairs of spray bar beams arranged in an upper and lower manner are arranged at intervals in the cooling section in the air cushion furnace along the conveying direction, wherein a plurality of fan-shaped nozzles are installed at intervals along the length direction of the spray bar beam, and a plurality of baffles are installed at intervals on the transmission side on one side of the spray bar beam and on the operating side on the other side of the spray bar beam along the conveying direction, wherein the baffles are arranged between the corresponding upper and lower spray bar beams, and the baffles on the transmission side and the operating side are driven by a driving mechanism to move laterally. The device and method are applicable to a continuous production line of an air cushion furnace requiring water quenching cooling, and are helpful to improving the quenching performance of strips.

Description

Technical Field

[0001] The invention relates to a device and a method for improving the quenching performance of a strip. Background Art

[0002] In the air cushion furnace production line, the strip needs to be water quenched. Normally, the valve switch of the spray bar beam is controlled to spray deionized water from the fan-shaped nozzle to the upper and lower surfaces of the strip. However, due to the angle and characteristics of the fan-shaped nozzle, there is a possibility that the lower nozzle will flush the deionized water to the upper surface, resulting in excessive water spraying or accumulation on the upper surface of the strip, especially on both sides of the strip. It is very easy for the strip to be cooled unevenly in the lateral direction. Summary of the invention

[0003] The object of the present invention is to provide a device and method for improving the quenching performance of strips. The device and method are suitable for a continuous production line of an air cushion furnace requiring water quenching cooling, and are helpful to improve the quenching performance of strips.

[0004] The technical solution of the present invention is: a device for improving the quenching performance of strip, comprising an air cushion furnace with a heating section and a cooling section, a light curtain and a laser rangefinder are arranged between the heating section and the cooling section in the air cushion furnace, a plurality of pairs of spray bar beams arranged in an upper and lower manner are arranged at intervals in the cooling section along the conveying direction in the air cushion furnace, a plurality of fan-shaped nozzles are installed at intervals along the length direction of the spray bar beam, a plurality of baffles are installed at intervals on the transmission side on one side of the spray bar beam and on the operating side on the other side of the spray bar beam along the conveying direction, the baffles are arranged between the corresponding upper and lower spray bar beams, and the baffles on the transmission side and the operating side are driven by a driving mechanism to move laterally.

[0005] Furthermore, the upper and lower parts of the air cushion furnace are both provided with air ducts connected to the circulation fan, the upper air duct is provided with downward air outlets along the conveying direction, and the lower air duct is provided with upward air outlets along the conveying direction.

[0006] Further, the fan-shaped nozzles on the upper spray boom beam are arranged downward, and the fan-shaped nozzles on the lower spray boom beam are arranged upward.

[0007] Furthermore, the driving mechanism includes a sliding frame, the baffles are installed on the sliding frame at intervals along the conveying direction, the front and rear parts of the cooling section are laterally provided with slide rails that cooperate with the sliding frame, the front and rear parts of the sliding frame are provided with nut seats and transverse screws that cooperate with the nut seats, and the front and rear parts of a driving shaft driven by a motor are connected to the corresponding transverse screws through gear pairs.

[0008] Furthermore, it also includes a PLC and a transmission device.

[0009] A method for improving the quenching performance of a strip includes a device for improving the quenching performance of a strip, and the steps are as follows:

[0010] (i) starting the device so that the strip is conveyed along the conveying direction between the transmission side and the operating side of the device;

[0011] (ii) Control the baffles on the operating side and the transmission side to move. The distance the baffles move is calculated as follows:

[0012] (1) Assuming that the strip floats to any position, when the light curtain detects that the position of the strip on the operating side is x1, according to the triangle similarity principle, x1' / x1=h3 / h2, that is, the position of the baffle on the operating side is x1'=x1*h3 / h2; similarly, the position of the baffle on the transmission side is x2'=x2*h3 / h2;

[0013] Among them, x1 is the distance converted from the edge of the operating side of the strip detected by the light curtain; x2 is the distance converted from the edge of the transmission side detected by the light curtain; h1 is the normal spraying height of the nozzle of the spray beam; h2 is the floating height of the strip, and h1>h2; h3 is the height of the blocking baffle from the nozzle;

[0014] (2) The distance of movement of the baffle is controlled by the transmission device, where the movement distance on the operating side is x1'=x1*h3 / h2, and the movement distance on the transmission side is x2'=x2*h3 / h2;

[0015] (3) There will be certain errors in the actual production process. Fixed deviation values ​​Δx1 and Δx2 can be set in the program for fine-tuning.

[0016] (4) The final control baffle movement distance: the operating side movement distance is x1'+Δx1, and the transmission side movement distance is x2'+Δx2, that is, x1'=x1*h3 / h2+Δx1 and x2'=x2*h3 / h2+Δx2.

[0017] The distance that the baffle moves must ensure that every position of the strip is covered by the spray areas of the two fan-shaped nozzles, and at the same time, it must be away from the floating strip, otherwise it is easy to cause bumps and lead to product quality problems.

[0018] The distance between the fan-shaped nozzles distributed on the spray boom beam is L0; when the floating height of the strip is h2, the coverage length of the ionized water sprayed out by the fan-shaped nozzle is 2L0, which is equivalent to that each position of the strip will be covered by the spray area of ​​2 nozzles.

[0019] Compared with the prior art, the present invention has the following advantages: the device and method are suitable for a continuous production line of an air cushion furnace requiring water quenching and cooling, and are helpful to enhance and improve the uniformity of the strip quenching performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the device of the present invention;

[0021] Figure 2 It is a cross-sectional view of the cooling section of the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified geometric diagram of area A;

[0023] Figure 4 It is a schematic diagram of the structure of the shielding device of the present invention;

[0024] Figure 5 It is a structural schematic diagram of the driving mechanism of the present invention;

[0025] Figure 6 A schematic diagram of the structure of the shielding device for drawing the upper spraying rod beam of the present invention;

[0026] Figure 7 It is a schematic diagram of the conveyance of the strip material on the shielding device of the present invention;

[0027] Figure 8 It is the geometric diagram of each parameter of the present invention;

[0028] In the figure: 1-strip 10-air cushion furnace 11-heating section 12-cooling section 13-wind direction of circulating fan 20-light curtain 30-laser rangefinder 40-spray rod beam 41-fan-shaped nozzle 42-upper spray rod beam 43-lower spray rod beam 50-baffle 51-sliding frame 52-slide rail 53-nut seat 54-transverse screw 55-motor 56-driving shaft 57-active helical gear 58-driven helical gear. DETAILED DESCRIPTION

[0029] In order to make the above features and advantages of the present invention more easily understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0030] refer to Figures 1 to 8

[0031] A device for improving the quenching performance of a strip includes an air cushion furnace 10 having a heating section 11 and a cooling section 12, wherein a light curtain 20 and a laser rangefinder 30 are arranged between the heating section and the cooling section in the air cushion furnace, wherein a plurality of pairs of spray bar beams 40 arranged in an upper and lower manner are arranged at intervals in the cooling section along the conveying direction in the air cushion furnace, wherein a plurality of fan-shaped nozzles 41 are installed at intervals along the length direction of the spray bar beams, for spraying deionized water onto the surface of the strip to cool the strip. A plurality of baffles 50 are installed at intervals along the conveying direction on the transmission side on one side of the spray bar beam and on the operating side on the other side of the spray bar beam, wherein the baffles are arranged between the corresponding upper and lower spray bar beams, and the baffles on the transmission side and the operating side are driven by a driving mechanism to move laterally, and the baffles and the driving mechanism constitute a shielding device. A PLC and a transmission device are also included, and the movement of the baffles and the floating of the strip are controlled by the transmission device.

[0032] In this example, the air cushion furnace can control the strip to be in a floating state, divided into a heating section and a cooling section, wherein the heating section heats and keeps the strip warm, and the cooling section quenches the strip, and there is a certain gap between the two sections. A light curtain 20 and a laser rangefinder 30 are arranged in the gap, and the light curtain is used to detect the position of the strip. The laser rangefinder is used to detect the floating height of the strip.

[0033] In this embodiment, the upper and lower parts of the air cushion furnace are both provided with air ducts connected to the circulation fan, the upper air duct is provided with downward air outlets along the conveying direction, and the lower air duct is provided with upward air outlets along the conveying direction.

[0034] In this embodiment, the fan-shaped nozzles on the upper spray bar beam are arranged downward, and the fan-shaped nozzles on the lower spray bar beam are arranged upward.

[0035] In this embodiment, the driving mechanism includes a sliding frame 51, and the baffles are installed on the sliding frame at intervals along the conveying direction. The front and rear parts of the cooling section are both laterally provided with slide rails 52 that cooperate with the sliding frame. The front and rear parts of the sliding frame are both provided with nut seats 53 and transverse lead screws 54 that cooperate with the nut seats. The front and rear parts of a driving shaft 56 driven by a motor 55 are fixed with active bevel gears 57, and one end of the transverse lead screw is fixed with a driven bevel gear 58 that cooperates with the active bevel gear. The driving shaft is driven by the motor, and the transverse lead screw is driven to rotate through the gear pair, so that the sliding frame drives the baffle to move a specified distance toward the operating side or the transmission side of the equipment to block the fan-shaped nozzle. The motor has a position feedback encoder.

[0036] A method for improving the quenching performance of a strip, comprising the above-mentioned device for improving the quenching performance of a strip, and the steps are as follows:

[0037] (i) starting the device so that the strip is conveyed along the conveying direction between the transmission side and the operating side of the device;

[0038] (ii) Control the baffles on the operating side and the transmission side to move. The distance the baffles move is calculated as follows:

[0039] The width capacity range that the device can produce is Lmin-Lmax; the number of fan-shaped nozzles distributed on the spray boom beam is x;

[0040] (1) Assuming that the strip floats to any position, when the light curtain detects that the strip position on the operating side is x1, auxiliary lines are drawn into a geometric diagram. Figure 3 As shown, point B is the injection point of the fan-shaped nozzle, point A is the axis center point of the operating side edge of the strip, point O is the intersection point of the extended line of the operating side edge of the strip and the vertical line of the fan-shaped nozzle injection point, A' is the axis center point of the inner side of the baffle, and O' is the intersection point of the vertical line of the fan-shaped nozzle injection point and the baffle;

[0041] It is not difficult to infer that △AOB and △A'O'B are similar; according to the triangle similarity principle, x1' / x1=h3 / h2, that is, the operating side baffle position x1'=x1*h3 / h2; similarly, the transmission side baffle position x2'=x2*h3 / h2;

[0042] Among them, x1 is the distance converted from the edge of the operating side of the strip detected by the light curtain; x2 is the distance converted from the edge of the transmission side detected by the light curtain; h1 is the normal spraying height of the nozzle of the spray beam, which can normally spray to the upper spray beam position; h2 is the floating height of the strip, and h1>h2; h3 is the height of the blocking baffle from the nozzle;

[0043] (2) The distance of movement of the baffle is controlled by the transmission device, where the movement distance on the operating side is x1'=x1*h3 / h2, and the movement distance on the transmission side is x2'=x2*h3 / h2;

[0044] (3) There will be certain errors in the actual production process. Fixed deviation values ​​Δx1 and Δx2 can be set in the program for fine-tuning.

[0045] (4) The final control baffle movement distance: the operating side movement distance is x1'+Δx1, and the transmission side movement distance is x2'+Δx2, that is, x1'=x1*h3 / h2+Δx1 and x2'=x2*h3 / h2+Δx2.

[0046] In this embodiment, the distance that the baffle moves must satisfy the requirement that each position of the strip is covered by the spraying areas of the two fan-shaped nozzles, and at the same time, it must be away from the floating strip, otherwise it is easy to cause bumps and lead to product quality problems.

[0047] In this embodiment, the length of the spray boom beam is L, L>Lmax, where L=(x-1)*L0; the distance between the fan-shaped nozzles distributed on the spray boom beam is L0, L0<Lmin; when the floating height of the strip is h2, the coverage length of the ionized water sprayed out by the fan-shaped nozzle is 2L0, which is equivalent to that each position of the strip will be covered by 2 nozzle spray areas.

[0048] In this example, the units of the above values ​​are all mm.

[0049] The above description is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, designing different forms of devices and methods for improving the quenching performance of strips does not require creative labor. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A device for improving the quenching performance of a strip, comprising an air cushion furnace having a heating section and a cooling section, characterized in that: A light curtain and a laser rangefinder are arranged between the heating section and the cooling section in the air cushion furnace. A plurality of pairs of spray bar beams arranged in an upper and lower manner are arranged at intervals in the cooling section along the conveying direction in the air cushion furnace. A plurality of fan-shaped nozzles are installed at intervals along the length direction of the spray bar beam. A plurality of baffles are installed at intervals along the conveying direction on the transmission side on one side of the spray bar beam and on the operating side on the other side of the spray bar beam. The baffles are arranged between the corresponding upper and lower spray bar beams, and the baffles on the transmission side and the operating side are driven by the driving mechanism to move laterally respectively; the driving mechanism includes a sliding frame, and the baffles are installed on the sliding frame at intervals along the conveying direction. The front and rear parts of the cooling section are both laterally provided with slide rails matching the sliding frame, and the front and rear parts of the sliding frame are both provided with nut seats and transverse lead screws matching the nut seats, and the front and rear parts of a drive shaft driven by a motor are both connected to the corresponding transverse lead screw through a gear pair; the distance moved by the baffle is calculated as follows: (1) Assuming that the strip floats to any position, when the light curtain detects that the position of the strip on the operating side is x1, according to the triangle similarity principle, x1' / x1=h3 / h2, that is, the position of the baffle on the operating side is x1'=x1*h3 / h2; similarly, the position of the baffle on the transmission side is x2'=x2*h3 / h2; Among them, x1 is the distance converted from the edge of the operating side of the strip detected by the light curtain; x2 is the distance converted from the edge of the transmission side detected by the light curtain; h1 is the normal spraying height of the nozzle of the spray beam; h2 is the floating height of the strip, and h1>h2; h3 is the height of the blocking baffle from the nozzle; (2) The distance of movement of the baffle is controlled by the transmission device, where the moving distance on the operating side is x1'=x1*h3 / h2, and the moving distance on the transmission side is x2'=x2*h3 / h2.

2. The device for improving the quenching performance of a strip according to claim 1, characterized in that: The upper and lower parts of the air cushion furnace are both provided with air ducts connected to the circulation fan. The upper air duct is provided with a downward air outlet along the conveying direction, and the lower air duct is provided with an upward air outlet along the conveying direction.

3. A device for improving the quenching performance of a strip according to claim 1 or 2, characterized in that: The fan-shaped nozzles on the upper spray bar beam are arranged downward, and the fan-shaped nozzles on the lower spray bar beam are arranged upward.

4. The device for improving the quenching performance of a strip according to claim 1, characterized in that: It also includes PLC and transmission.

5. A method for improving the quenching performance of a strip, comprising the device for improving the quenching performance of a strip as claimed in claim 4, characterized in that: Here are the steps: (i) starting the device so that the strip is conveyed along the conveying direction between the transmission side and the operating side of the device; (ii) Control the baffles on the operating side and the transmission side to move. The distance the baffles move is calculated as follows: (1) Assuming that the strip floats to any position, when the light curtain detects that the position of the strip on the operating side is x1, according to the triangle similarity principle, x1' / x1=h3 / h2, that is, the position of the baffle on the operating side is x1'=x1*h3 / h2; similarly, the position of the baffle on the transmission side is x2'=x2*h3 / h2; Among them, x1 is the distance converted from the edge of the operating side of the strip detected by the light curtain; x2 is the distance converted from the edge of the transmission side detected by the light curtain; h1 is the normal spraying height of the nozzle of the spray beam; h2 is the floating height of the strip, and h1>h2; h3 is the height of the blocking baffle from the nozzle; (2) The distance of movement of the baffle is controlled by the transmission device, where the movement distance on the operating side is x1'=x1*h3 / h2, and the movement distance on the transmission side is x2'=x2*h3 / h2; (3) There will be certain errors in the actual production process. Fixed deviation values ​​Δx1 and Δx2 can be set in the program for fine-tuning. (4) The final control baffle movement distance: the operating side movement distance is x1'+Δx1, and the transmission side movement distance is x2'+Δx2, that is, x1'=x1*h3 / h2+Δx1 and x2'=x2*h3 / h2+Δx2.

6. A method for improving the quenching performance of a strip according to claim 5, characterized in that: The distance that the baffle moves must ensure that every position of the strip is covered by the spray area of ​​​​the two fan-shaped nozzles, and at the same time, it must be away from the floating strip, otherwise it is easy to cause bumps and lead to product quality problems.

7. A method for improving the quenching performance of a strip according to claim 5 or 6, characterized in that: The distance between the fan-shaped nozzles distributed on the spray boom beam is L0; when the floating height of the strip is h2, the coverage length of the ionized water sprayed out by the fan-shaped nozzle is 2L0, which is equivalent to that each position of the strip will be covered by the spray area of ​​2 nozzles.

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