A continuous casting immersion nozzle insertion depth control device and method

Abstract

The present invention belongs to the technical field of steelmaking continuous casting section, and specifically relates to a continuous casting submerged nozzle insertion depth control device and method. The submerged nozzle insertion depth control device includes a measuring component and an adjusting component; the measuring component has a first vertical section, a second vertical section and a horizontal section, and the two ends of the horizontal section are respectively fixedly connected to the first vertical section and the second vertical section, and the measuring component is used to measure the submerged nozzle insertion depth; the adjusting component includes a tundish lifting cylinder, a displacement sensor, a PLC controller and a limit detection switch, and the adjusting component is used to adjust the submerged nozzle insertion depth. The continuous casting submerged nozzle insertion depth control device of the present invention can solve or alleviate the problem that the submerged nozzle insertion depth is not easy to stabilize and will have an adverse effect on product quality in the current continuous casting process.

Description

Technical Field

[0001] The invention belongs to the technical field of steelmaking continuous casting section, and particularly relates to a continuous casting immersion nozzle insertion depth control device and method. Background Art

[0002] The submerged nozzle is a refractory sleeve installed at the bottom of the intermediate tank in the continuous steel casting equipment and inserted below the steel liquid level of the crystallizer. The main functions of the submerged nozzle are to prevent secondary oxidation of the intermediate tank injection flow and splashing of molten steel, to prevent the mold protection slag from being drawn into the molten steel, and to improve the flow state and heat flow distribution of the injection flow in the crystallizer. This will promote the uniform growth of the billet shell in the crystallizer and facilitate the removal of gas and inclusions in the steel. Since the submerged nozzle has significant effects on improving the quality of the billet, improving working conditions, stabilizing the continuous casting operation, and preventing billet surface defects, this nozzle is almost always used for casting in the continuous casting process.

[0003] In the continuous casting process of iron and steel metallurgy, in order to achieve stable product quality, the flow field of the crystallizer is usually simulated and fed back to the daily operation management, that is, it is achieved by stabilizing the insertion depth of the submerged nozzle.

[0004] The insertion depth measurement method of the immersion nozzle in the prior art cannot be measured accurately, which makes the flow field of the crystallizer difficult to stabilize and easily leads to product quality problems.

[0005] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a continuous casting submerged nozzle insertion depth control device and method to solve or alleviate the problem that the submerged nozzle insertion depth is not stable and has an adverse effect on product quality in the current continuous casting process.

[0007] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a continuous casting submerged nozzle insertion depth control device, the submerged nozzle is arranged at the bottom of the tundish, the tundish is arranged on the tundish car, the submerged nozzle insertion depth control device includes a measuring component and an adjusting component; the measuring component has a first vertical section, a second vertical section and a horizontal section, the two ends of the horizontal section are respectively fixedly connected to the first vertical section and the second vertical section, the measuring component is used to measure the insertion depth of the submerged nozzle; the adjusting component includes a tundish lifting cylinder, a displacement sensor, a PLC controller and a limit detection switch, and the adjusting component is used to adjust the submerged nozzle insertion depth. The insertion depth of the water nozzle can be adjusted; the tundish lifting cylinder has a fixed end and a telescopic end, the fixed end is fixed on the tundish car, and the telescopic end is fixedly connected to the tundish, the telescopic end of the tundish lifting cylinder rises and falls in a direction parallel to the first vertical section and / or the second vertical section, and the submerged water nozzle is synchronized with the displacement of the telescopic end of the tundish lifting cylinder; the displacement sensor is connected to the PLC controller signal, and the displacement sensor is used to detect the displacement of the submerged water nozzle; the limit detection switch is connected to the PLC controller signal, and the signal of the limit detection switch changes when the tundish car is located above the crystallizer.

[0008] Preferably, the displacement sensor is arranged on the tundish car, and the displacement sensor is connected to the tundish lifting cylinder, and is used for real-time monitoring of the displacement of the telescopic end of the tundish lifting cylinder, so that the PLC controller can determine the displacement of the submerged water inlet and / or the insertion depth of the submerged water inlet.

[0009] Preferably, a manual control valve and a solenoid valve are provided on the tundish lifting cylinder, and the solenoid valve is connected to the PLC controller signal.

[0010] Preferably, the displacement sensor is connected to the PLC controller via a 4-20mA signal.

[0011] Preferably, the adjustment component also includes an operating computer, and the operating computer is connected to the PLC controller signal.

[0012] Preferably, the measuring assembly further comprises a handle, wherein the handle is anti-parallel to the horizontal section.

[0013] More preferably, the measuring component is an iron measuring component and / or a copper measuring component, and the radial cross-section of the measuring component is circular, and the diameter of the circle is 1 mm.

[0014] Preferably, the mid-cart is provided with a mid-cart control switch, and the mid-cart control switch has a manual control working position and an automatic control working position; the mid-cart control switch is connected to the PLC controller signal.

[0015] Preferably, a horizontal scale line is provided on the immersion nozzle, and the horizontal scale line is used to cooperate with the horizontal section to measure the insertion depth of the immersion nozzle.

[0016] The present invention also provides a method for controlling the insertion depth of a continuous casting submerged nozzle, which adopts the following technical scheme: using the continuous casting submerged nozzle insertion depth control device as described above to control the insertion depth of the submerged nozzle, comprising the following steps: (1) receiving the electrical signal emitted by the limit detection switch when the tundish is located above the crystallizer; (2) manually controlling the lifting and lowering of the tundish until the insertion depth of the submerged nozzle calculated according to the measurement result of the measuring component is a set value, and a displacement sensor detects the displacement value of the submerged nozzle; (3) receiving the displacement value transmitted by the displacement sensor; (4) receiving the electrical signal emitted by the limit detection switch when the tundish is located at a position other than above the crystallizer; (5) receiving the electrical signal emitted by the limit detection switch when the tundish is located above the crystallizer, and controlling the lifting and lowering of the tundish lifting cylinder until the displacement value detected by the displacement sensor is equal to the displacement value in step (3).

[0017] Preferably, before step (2), the method further includes the step of adjusting the control switch of the mid-sized package car to the manual control working position; and before step (5), the method further includes the step of adjusting the control switch of the mid-sized package car to the automatic control working position.

[0018] Preferably, when the measuring component measures the insertion depth of the submerged nozzle, the following steps are included: (a) making the horizontal section coincide with the horizontal scale line, and inserting the first vertical section into the molten steel of the crystallizer; (b) taking the first vertical section out of the molten steel, and measuring the length of the portion of the first vertical section inserted into the molten steel; (c) calculating the insertion depth of the submerged nozzle.

[0019] Beneficial effects: The continuous casting submerged nozzle insertion depth control device of the present invention includes a measuring component and an adjusting component. The setting of the measuring component enables accurate measurement of the inserted nozzle; the PLC controller in the adjusting component can adjust the lifting and lowering of the tundish lifting cylinder according to the measurement results of the measuring component and the signals transmitted by the displacement sensor and the limit detection switch until the insertion depth of the submerged nozzle reaches the set requirements, thereby realizing automatic control of the insertion depth of the submerged nozzle and reducing repeated operations of operators. In addition, it can also effectively avoid or alleviate the problem of unstable product quality caused by different insertion depths of the submerged nozzle due to personal differences or misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0021] Figure 1 It is a schematic structural diagram of the positional relationship between the adjustment component, the tundish and the tundish car in the continuous casting submerged nozzle insertion depth control device according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the control logic structure of the adjustment component in the continuous casting submerged nozzle insertion depth control device according to an embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of a measuring component in a continuous casting submerged nozzle insertion depth control device according to an embodiment of the present invention;

[0024] Figure 4 It is a schematic diagram of the working state structure of the measuring component in the continuous casting submerged nozzle insertion depth control device according to an embodiment of the present invention;

[0025] Reference numerals:

[0026] 1- tundish; 2- tundish car; 3- measuring assembly;

[0027] 11- immersion nozzle; 111- horizontal scale line; A- length of the first vertical section; B- distance between the horizontal scale line and the lower mouth of the immersion nozzle; C- length of the first vertical section inserted into the molten steel; X- insertion depth of the immersion nozzle;

[0028] 31-first vertical section; 32-second vertical section; 33-horizontal section; 34-handle;

[0029] 41- tundish lifting cylinder; 411- solenoid valve; 42- displacement sensor; 43- limit detection switch; 44- PLC controller; 45- operation computer;

[0030] 51- medium package vehicle control switch; 52- manual control valve. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0032] The present invention will be described in detail below in conjunction with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0033] In view of the fact that the current immersion nozzle insertion depth is difficult to determine, which makes the crystallizer flow field difficult to stabilize and easily causes product quality defects, the present invention proposes a continuous casting immersion nozzle insertion depth control device.

[0034] like Figure 1-4 As shown, a continuous casting submerged nozzle insertion depth control device, the submerged nozzle 11 is arranged at the bottom of the tundish 1, the tundish 1 is arranged on the tundish car 2, the submerged nozzle insertion depth control device includes a measuring component and an adjusting component; the measuring component has a first vertical section 31, a second vertical section 32 and a horizontal section 33, the two ends of the horizontal section 33 are respectively fixedly connected to the first vertical section 31 and the second vertical section 32, the measuring component is used to measure the insertion depth of the submerged nozzle; the adjusting component includes a tundish lifting cylinder 41, a displacement sensor 42, a PLC controller 44 and a limit detection switch 43, and the adjusting component is used to adjust the insertion depth of the submerged nozzle 11. The tundish lifting cylinder 41 has a fixed end and a telescopic end, the fixed end is fixed on the tundish car 2, and the telescopic end is fixedly connected to the tundish 1. The telescopic end of the tundish lifting cylinder 41 rises and falls in a direction parallel to the first vertical section 31 and / or the second vertical section 32, and the displacement of the submerged water inlet 11 is synchronized with the displacement of the telescopic end of the tundish lifting cylinder 41; the displacement sensor 42 is connected to the PLC controller 44 by signal, and the displacement sensor 42 is used to detect the displacement of the submerged water inlet 11; the limit detection switch 43 is connected to the PLC controller 44 by signal, and the signal of the limit detection switch 43 changes when the tundish car 2 is located above the crystallizer ( Figure 1 The "not in place" in the figure refers to the state of the tundish 1 when the insertion depth of the immersion nozzle 11 has not reached the set value; the "in place" refers to the state of the tundish 1 when the insertion depth of the immersion nozzle 11 has reached the set value).

[0035] The continuous casting submerged nozzle insertion depth control device of the present invention comprises a measuring component 3 and an adjusting component. The setting of the measuring component 3 enables the insertion depth of the submerged nozzle to be accurately measured; the PLC controller 44 in the adjusting component can regulate the lifting and lowering of the tundish lifting cylinder 41 according to the measurement result of the measuring component 3 and the signal transmitted by the displacement sensor 42 and the limit detection switch 43 until the insertion depth of the submerged nozzle reaches the set requirement (set value), thereby realizing automatic control of the insertion depth of the submerged nozzle and reducing repeated operations of the operator. In addition, it can also effectively avoid or alleviate the problem of unstable product quality caused by different insertion depths of the submerged nozzle due to personal differences or misoperation.

[0036] Among them, the "signal connection" in the present invention can be connected by a signal line (i.e., wired connection) or by a local network signal connection (i.e., wireless connection), which is not limited here and is within the protection scope of the present invention. The material of the measuring component 3 can be iron and / or copper. For example, the measuring component 3 can be an iron wire or a copper wire (with a diameter of 1 mm), etc., and can also be made into other shapes (e.g., plate-shaped, strip-shaped, rod-shaped, etc.) according to actual needs, which is not specifically limited here.

[0037] In a preferred embodiment of the present invention, a displacement sensor 42 is installed on the tundish car 2, and the displacement sensor 42 is connected to the tundish lifting cylinder 41 (specifically, an inductive magnet slider 421 is provided on the displacement sensor 42, and the inductive magnet slider 421 is connected to the telescopic movable section (not shown in the figure) of the tundish lifting cylinder 41 through a fixed connecting rod (not shown in the figure)), which is used for real-time monitoring of the displacement of the telescopic end of the tundish lifting cylinder 41, so that the PLC controller 44 can determine the displacement of the submerged water inlet 11 and / or the insertion depth of the submerged water inlet 11.

[0038] In the preferred embodiment of the present invention, a manual control valve 52 (manually controlling the raising and lowering of the tundish lifting cylinder 41) and a solenoid valve 411 are provided on the tundish lifting cylinder 41, and the solenoid valve 411 is connected to the PLC controller 44 by signal. The setting of the manual control valve 52 enables the raising and lowering of the tundish lifting cylinder 41 to be manually adjusted, so that the operator can manually operate when the insertion depth of the submerged nozzle is initially detected; the setting of the solenoid valve 411 enables the PLC controller 44 to automatically realize the raising and / or lowering of the tundish lifting cylinder 41 according to the received signal and the set program, thereby realizing the automatic control and adjustment of the insertion depth of the submerged nozzle.

[0039] In a preferred embodiment of the present invention, the tundish lifting cylinder 41 is a hydraulic lifting cylinder.

[0040] In a preferred embodiment of the present invention, the displacement sensor 42 is connected to the PLC controller 44 via a 4-20 mA signal.

[0041] In a preferred embodiment of the present invention, the adjustment component further comprises an operating computer 45, which is signal-connected to the PLC controller 44. The setting of the operating computer 45 enables an operator to set an initial setting value on the operating computer 45 for controlling the automatic placement of the tundish 1.

[0042] In a preferred embodiment of the present invention, the measuring assembly further comprises a handle 34, which is inversely parallel to the horizontal section 33. By providing the handle 34, when the measuring assembly is used to manually measure the insertion depth of the immersion nozzle, the handle 34 can be held by hand, thereby improving the safety of the use of the measuring assembly.

[0043] In a preferred embodiment of the present invention, the measuring assembly is an iron measuring assembly and / or a copper measuring assembly, and the radial cross-section of the measuring assembly is circular and the diameter of the circle is 1 mm. In a preferred embodiment of the present invention, a middle ladle car control switch 51 is provided on the middle ladle car 2, and the middle ladle car control switch 51 has a manual control working position and an automatic control working position; the middle ladle car control switch 51 is connected to the PLC controller 44 by signal. In actual application, a braking system may also be provided on the middle ladle car 2, and when the middle ladle car control switch 51 is in the automatic control position, the braking system of the middle ladle car 2 is connected to the PLC controller 44 by signal, so that when the middle ladle car control switch 51 is in the automatic control position, the braking system of the middle ladle car 2 is connected to the PLC controller 44 by signal, so that when the limit detection switch 43 detects that the middle ladle car 2 is located above the crystallizer, the PLC controller receives the signal detected by the limit detection switch 43 (indicating that the middle ladle car 2 has reached the set position), and can control the braking system of the middle ladle car 2 to work, so that the tundish 1 stops moving at this position.

[0044] In a preferred embodiment of the present invention, a horizontal scale line 111 is provided on the immersion nozzle 11, and the horizontal scale line 111 is used to cooperate with the horizontal section 33 to measure the insertion depth of the immersion nozzle 11. That is, when using the measuring component, the horizontal section 33 is made to coincide with the horizontal scale line 111, which can effectively avoid the measurement result error caused by the offset of the position where the measuring component is placed. Among them, the position of the horizontal scale line 111 should be determined. For example, in actual application, the horizontal scale line 111 can be set at a position 250mm away from the lower mouth of the immersion nozzle 11 (one end immersed in the molten steel of the crystallizer) (it can also be set at other positions, and for actual users, it is sufficient to be able to confirm the position of the horizontal scale line 111).

[0045] The present invention also provides a method for controlling the insertion depth of a continuous casting submerged water nozzle, which uses the continuous casting submerged water nozzle insertion depth control device as described above to control the insertion depth of the submerged water nozzle 11, including the following steps: (1) receiving an electrical signal emitted by a limit detection switch 43 when the tundish 1 is located above the crystallizer; (2) manually controlling the lifting and lowering of the tundish 1 until the insertion depth of the submerged water nozzle 11 calculated according to the measurement result of the measuring component is a set value (wherein the set value can be a specific data; or it can be a data range - that is, the set value can be any data within the data range), and the displacement sensor 42 detects the displacement value of the submerged water nozzle 11 (the displacement value directly detected by the displacement sensor 42 is the displacement value of the telescopic end of the tundish lifting cylinder 41, but since the displacement value of the submerged water nozzle 11 = the displacement value of the tundish 1 = the displacement value of the telescopic end of the tundish lifting cylinder 41, therefore, in the actual detection process, the position sensor 42 can be used to detect the displacement value of the submerged water nozzle 11. The displacement value detected by the displacement sensor 42 is used as the displacement value of the submerged water inlet 11); (3) receiving the displacement value transmitted by the displacement sensor 42; (4) receiving the electrical signal sent by the limit detection switch 43 when the tundish 1 is located at a position other than above the crystallizer (when the tundish car 2 is located at a position other than above the crystallizer, the signal detected by the limit detection switch 43 will change and transmit the signal to the PLC controller 44, indicating that the tundish car 2 has left the top of the crystallizer. After receiving the signal, the PLC controller 44 will no longer control the operation of the tundish lifting cylinder 41, etc.); (5) receiving the electrical signal sent by the limit detection switch 43 when the tundish 1 is located above the crystallizer (indicating that the tundish car 2 is now located at the position where the submerged water inlet 11 needs to be inserted into the inside of the crystallizer), and controlling the lifting and lowering of the tundish lifting cylinder 41 until the displacement value detected by the displacement sensor 42 is equal to the displacement value in step (3).

[0046] In a preferred embodiment of the present invention, before step (2), the step of adjusting the control switch 51 of the middle package car to the manual control working position is also included; before step (5), the step of adjusting the control switch 51 of the middle package car to the automatic control working position is also included.

[0047] In a preferred embodiment of the present invention, when the measuring component measures the insertion depth of the immersion nozzle 11, the following steps are included:

[0048] (a) aligning the horizontal section 33 with the horizontal scale line 111, and inserting the first vertical section 31 (fitting with the submerged nozzle 11) into the molten steel of the crystallizer;

[0049] (b) taking the first vertical section 31 out of the molten steel and measuring the length of the portion of the first vertical section 31 inserted into the molten steel;

[0050] (c) Calculate the insertion depth of the submerged nozzle 11.

[0051] Among them, Figure 4 As shown, in step (a), the length of the first vertical section 31 is A, the distance between the horizontal scale line 111 and the lower mouth of the immersion nozzle 11 is B (A and B can be measured before the measuring component is used), and after the first vertical section 31 is taken out from the molten steel, the length of the part of the first vertical section 31 inserted into the molten steel is measured to be C, then the immersion nozzle insertion depth X = B-(AC).

[0052] The material of the measuring component can be iron or copper. Since the first vertical section 31 of the measuring component is inserted into the molten steel and then taken out of the molten steel, the steps can be completed in a relatively short time (for example, the first vertical section 31 only needs to stay in the molten steel for a few seconds), the first vertical section 31 will not be melted by the molten steel, and the surface of the part in contact with the molten steel (i.e., the part of the first vertical section 31 inserted into the molten steel, with a length of C) is attached with red cold steel, which is convenient for measuring its length C.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A continuous casting submerged nozzle insertion depth control device, wherein the submerged nozzle is arranged at the bottom of a tundish, and the tundish is arranged on a tundish car, characterized in that: The submerged nozzle insertion depth control device comprises a measuring component and an adjusting component; The measuring assembly comprises a first vertical section, a second vertical section and a horizontal section, two ends of the horizontal section are respectively fixedly connected to the first vertical section and the second vertical section, and the measuring assembly is used to measure the insertion depth of the immersion nozzle; The adjustment component includes a tundish lifting cylinder, a displacement sensor, a PLC controller and a limit detection switch, and the adjustment component is used to adjust the insertion depth of the submerged nozzle; The tundish lifting cylinder has a fixed end and a telescopic end, the fixed end is fixed to the tundish car, the telescopic end is fixedly connected to the tundish, the telescopic end of the tundish lifting cylinder rises and falls in a direction parallel to the first vertical section and / or the second vertical section, and the submerged nozzle is synchronously displaced with the telescopic end of the tundish lifting cylinder; The displacement sensor is connected to the PLC controller signal, and the displacement sensor is used to detect the displacement of the submerged water outlet; The limit detection switch is connected to the PLC controller signal, and the signal of the limit detection switch changes when the tundish car is located above the crystallizer; The displacement sensor is arranged on the tundish car, and is connected to the tundish lifting cylinder, and is used to monitor the displacement of the telescopic end of the tundish lifting cylinder in real time, so that the PLC controller can determine the displacement of the submerged nozzle and / or the insertion depth of the submerged nozzle; The tundish lifting cylinder is provided with a manual control valve and a solenoid valve, and the solenoid valve is connected to the PLC controller signal.

2. The continuous casting submerged nozzle insertion depth control device according to claim 1, characterized in that: The displacement sensor is connected to the PLC controller via a 4-20mA signal.

3. The continuous casting submerged nozzle insertion depth control device according to claim 1, characterized in that: The adjustment component also includes an operating computer, and the operating computer is connected to the PLC controller signal.

4. The continuous casting submerged nozzle insertion depth control device according to claim 1, characterized in that: The measuring assembly also includes a handle, the handle being anti-parallel to the horizontal section.

5. The continuous casting submerged nozzle insertion depth control device according to claim 1, characterized in that: The measuring component is an iron measuring component and / or a copper measuring component, and the radial cross section of the measuring component is circular, and the diameter of the circle is 1 mm.

6. The continuous casting submerged nozzle insertion depth control device according to claim 1, characterized in that: The medium-sized car is provided with a medium-sized car control switch, and the medium-sized car control switch has a manual control working position and an automatic control working position; The middle package car control switch is connected to the PLC controller signal.

7. The continuous casting submerged nozzle insertion depth control device according to any one of claims 1 to 6, characterized in that: A horizontal scale line is provided on the submerged water outlet, and the horizontal scale line is used to cooperate with the horizontal section to measure the insertion depth of the submerged water outlet.

8. A method for controlling the insertion depth of a continuous casting submerged nozzle, characterized in that: The continuous casting submerged nozzle insertion depth control device according to any one of claims 1 to 7 is used to control the insertion depth of the submerged nozzle, comprising the following steps: (1) receiving an electrical signal sent by the limit detection switch when the tundish is located above the crystallizer; (2) manually controlling the lifting and lowering of the tundish until the insertion depth of the submerged nozzle calculated according to the measurement result of the measuring component is a set value, and a displacement sensor detects the displacement value of the submerged nozzle; (3) receiving the displacement value transmitted by the displacement sensor; (4) receiving an electrical signal sent by the limit detection switch when the tundish is located at a position other than above the crystallizer; (5) receiving the electrical signal sent by the limit detection switch when the tundish is located above the crystallizer, and controlling the lifting of the tundish lifting cylinder until the displacement value detected by the displacement sensor is equal to the displacement value in step (3).

9. The continuous casting submerged nozzle insertion depth control method according to claim 8, characterized in that: Before step (2), the method further includes adjusting the control switch of the mid-pack vehicle to a manual control working position; Before step (5), the method also includes the step of adjusting the control switch of the mid-pack car to the automatic control working position.

10. The continuous casting submerged nozzle insertion depth control method according to claim 8 or 9, characterized in that: When the measuring component measures the insertion depth of the submerged nozzle, the following steps are included: (a) aligning the horizontal section with the horizontal scale line and inserting the first vertical section into the molten steel in the crystallizer; (b) taking the first vertical section out of the molten steel and measuring the length of the portion of the first vertical section inserted into the molten steel; (c) Calculate the insertion depth of the submerged nozzle.

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