System and method for detecting bending degree of auxiliary lance of steelmaking converter

Abstract

On one hand, the present invention provides a system for detecting the bending degree of the auxiliary gun of a steelmaking converter, comprising: an auxiliary gun probe and a measuring position limiter, a signal acquisition device, the signal acquisition device is used to collect image information of the auxiliary gun probe; a signal processing device, the signal processing device is used to receive the image information, and obtain an image display interface after analyzing the image information, and then output the analysis result; a signal control device, the signal control device is used to automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result. On the other hand, the present application also provides a method for detecting the bending degree of the auxiliary gun of a steelmaking converter. The present application solves the technical problem in the prior art that the bending of the auxiliary gun cannot be detected in time, which easily causes damage to the auxiliary gun and affects production, reduces the equipment failure rate, and improves production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgy, and in particular to a system and method for detecting the bending degree of a steelmaking converter auxiliary gun. Background Art

[0002] The auxiliary gun of the steelmaking converter is the main means used in converter smelting, mainly for determining the oxygen content and carbon content of molten steel. The operation of the auxiliary gun is to connect the probe at the connection position, then rotate it to the measurement position, and then lower the gun to enter the converter through the auxiliary gun mouth for detection. Due to the high temperature of the molten steel in the converter, the lower end of the gun body will bend to one side during the long-term use of the auxiliary gun, and the auxiliary gun mouth is relatively small. If the auxiliary gun bending is not handled in time, the bending degree will be too large, causing the auxiliary gun to be inserted outside the auxiliary gun mouth, resulting in measurement failure and damage to the auxiliary gun. It is not obvious through video viewing and cannot be discovered in time. The operator needs to lower the auxiliary gun to the auxiliary gun mouth position for inspection. Here, the oxygen gun mouth, oxygen gun, and hoisting crane operation environment are relatively complex and dangerous, and it wastes manpower and is not necessarily timely, causing the auxiliary gun to be damaged and affect production. Therefore, it is necessary to find a way to prompt the bending degree of the auxiliary gun, remind the operator to deal with or replace the auxiliary gun in time, and avoid the auxiliary gun being inserted outside the auxiliary gun mouth when measuring the lower gun, causing measurement failure and damage to the auxiliary gun, which affects production. Summary of the invention

[0003] The embodiment of the present application provides a system and method for detecting the bending degree of the auxiliary lance of a steelmaking converter, thereby solving the technical problem in the prior art that the bending of the auxiliary lance cannot be detected in time, which easily causes damage to the auxiliary lance and affects production, thereby reducing the equipment failure rate and improving production efficiency.

[0004] On the one hand, an embodiment of the present application provides a system for detecting the bending degree of a steelmaking converter auxiliary lance, comprising:

[0005] Auxiliary gun probe, the auxiliary gun probe is connected to the plug-in connector of the auxiliary gun;

[0006] A measuring position limiter, the measuring position limiter is used to limit the auxiliary gun probe to the measuring position;

[0007] A signal acquisition device, the signal acquisition device is used to acquire image information of the auxiliary gun probe;

[0008] A signal processing device, the signal processing device is used to receive the image information, analyze the image information to obtain an image display interface, and then output the analysis result;

[0009] A signal control device is used to automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result.

[0010] Furthermore, the signal acquisition device comprises:

[0011] A first camera, which is arranged on the east or west side of the auxiliary gun muzzle, and is used to collect image information of the auxiliary gun probe bending in the north-south direction;

[0012] The second camera is arranged on the north side or the south side of the auxiliary gun muzzle, and the second camera is used to collect image information of the auxiliary gun probe bending in the east-west direction.

[0013] Furthermore, the first camera and the second camera are of the same model, and the lenses are arranged horizontally and perpendicular to each other.

[0014] Furthermore, the signal processing device comprises:

[0015] A management server, the management server is used to receive the image information collected by the first camera and the second camera, analyze the image information to obtain an image display interface, and then output the analysis result;

[0016] Wincc host computer, the Wincc host computer is used to receive the analysis result and send the analysis result to the signal control device.

[0017] Furthermore, the signal control device is a PLC, and the PLC is used to receive the analysis result sent by the wincc host computer, and automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result.

[0018] Another aspect of the present application embodiment provides a method for detecting the bending degree of a steelmaking converter auxiliary lance, which is applied to the above-mentioned steelmaking converter auxiliary lance bending degree detection system, comprising:

[0019] Before the auxiliary gun is put into use, standard image information of the auxiliary gun probe is collected;

[0020] After the auxiliary gun is put into use, the comparative image information of the auxiliary gun probe is collected;

[0021] Comparing and analyzing the comparison image information with the standard image information to obtain an analysis result;

[0022] According to the analysis result, whether the auxiliary gun at the measuring position continues to perform the gun lowering operation is automatically controlled.

[0023] Furthermore, before the auxiliary gun is put into use, collecting standard image information of the auxiliary gun probe includes:

[0024] Before the auxiliary gun is put into use, take a new, unbent auxiliary gun, connect the auxiliary gun to the auxiliary gun probe, and rotate it to the measuring position, that is, the auxiliary gun faces the auxiliary gun muzzle and the auxiliary gun body is vertical;

[0025] Collecting the first standard image information of the line connecting the starting point and the end point of the auxiliary gun probe on the east or west side of the auxiliary gun probe;

[0026] The second standard image information of the line connecting the starting point and the end point of the auxiliary gun probe on the north side or the south side of the auxiliary gun probe is collected.

[0027] Furthermore, after the auxiliary gun is put into use, collecting the comparative image information of the auxiliary gun probe includes:

[0028] Collecting first comparative image information of a line connecting the starting point and the end point of the auxiliary gun probe in the north-south direction of the auxiliary gun probe;

[0029] The second comparison image information of the line connecting the starting point and the end point of the auxiliary gun probe in the east-west direction of the auxiliary gun probe is collected.

[0030] Furthermore, the comparison image information is compared and analyzed with the standard image information to obtain the analysis result, including:

[0031] Calculate the angle formed by the connecting line in the first standard image information and the connecting line in the first comparison image information to obtain a first angle;

[0032] Calculate the angle formed by the connecting line in the second standard image information and the connecting line in the second comparison image information to obtain a second angle;

[0033] When any one of the first angle and the second angle is greater than 35 degrees and less than or equal to 40 degrees, an alarm message is issued, and a signal is given to process or replace the gun body of the auxiliary gun;

[0034] When any one of the first angle and the second angle is greater than 40 degrees, an alarm message is issued, and a signal is given to process or replace the auxiliary gun body, and the gun cannot be lowered;

[0035] Receive a high-level signal of the measuring position limit, and when the first angle and the second angle are less than or equal to 40 degrees, give a signal allowing the gun to be lowered;

[0036] A high level signal of the measuring position limit is received, and when the first angle and the second angle are greater than 40 degrees, a signal not allowing the gun to be lowered is given.

[0037] Furthermore, automatically controlling whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result includes:

[0038] After receiving a signal for processing or replacing the auxiliary gun body, processing or replacing the auxiliary gun body;

[0039] After receiving a signal indicating that the auxiliary gun body is to be processed or replaced and the gun cannot be lowered, the auxiliary gun body is processed or replaced, and the auxiliary gun is not lowered;

[0040] After receiving the gun lowering permission signal, performing a gun lowering operation on the auxiliary gun;

[0041] After receiving the gun lowering not allowed signal, the auxiliary gun is not lowered.

[0042] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0043] This application uses image recognition technology to analyze and compare the starting and ending positions of the auxiliary gun probe, prompt the degree of bending of the auxiliary gun, and remind the operator to deal with or replace the auxiliary gun in time to avoid the auxiliary gun being inserted outside the auxiliary gun muzzle when measuring the lower gun, causing measurement failure and auxiliary gun damage, and other problems, which affect production. The full electronicization of the process reduces the workload of operators, reduces the chance of personal injury, reduces equipment failure rate, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a system for detecting the bending degree of a steelmaking converter auxiliary lance provided in Example 1 of the present application;

[0045] Figure 2 This is a logic block diagram of the working system of the bending degree detection system of the steelmaking converter auxiliary gun provided in Example 1 of the present application. DETAILED DESCRIPTION

[0046] The present invention proposes a system and method for detecting the bending degree of a steelmaking converter auxiliary gun. The system is a method for identifying the probe of the auxiliary gun at the measuring position, detecting the bending degree, and prompting the auxiliary gun to be processed or replaced. The system uses image recognition technology and the starting and ending positions of the probe inserted into the auxiliary gun to analyze and compare, prompt the bending degree of the auxiliary gun, and remind maintenance personnel to process or replace the auxiliary gun in time to avoid the auxiliary gun being inserted outside the auxiliary gun muzzle when measuring the lower gun, causing measurement failure and auxiliary gun damage.

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] Embodiment 1

[0049] like Figure 1As shown, on the one hand, an embodiment of the present application provides a system for detecting the bending degree of a steelmaking converter auxiliary gun, comprising: an auxiliary gun probe 1, a measuring position limit, a signal acquisition device, a signal processing device and a signal control device, the auxiliary gun probe 1 is connected to a connector of the auxiliary gun; the measuring position limit is used to limit the auxiliary gun probe 1 to the measuring position; the signal acquisition device is used to collect image information of the auxiliary gun probe 1; the signal processing device is used to receive the image information, and analyze the image information to obtain an image display interface, and then output the analysis result; the signal control device is used to automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result.

[0050] The signal acquisition device includes: a first camera 2 and a second camera 3. The first camera 2 is set on the east or west side of the auxiliary gun muzzle 4, and the first camera 2 is used to collect image information of the auxiliary gun probe 1 bent in the north-south direction; the second camera 3 is set on the north or south side of the auxiliary gun muzzle 4, and the second camera 3 is used to collect image information of the auxiliary gun probe 1 bent in the east-west direction. The first camera 2 and the second camera 3 are of the same model, and the lenses are set horizontally and perpendicular to each other.

[0051] The signal processing device includes: a management server and a Wincc host computer. The management server is used to receive image information collected by the first camera 2 and the second camera 3, and obtain an image display interface after analyzing the image information, and then output the analysis results; the Wincc host computer is used to receive the analysis results and send the analysis results to the signal control device.

[0052] The signal control device is a PLC, which is used to receive the analysis results sent by the wincc host computer, and automatically control whether the auxiliary gun at the measuring position continues to lower the gun according to the analysis results.

[0053] Under long-term high-temperature use, the auxiliary gun cannot remain straight all the time and will have a certain degree of bending. Inspections by monitoring video and operators may not be timely, and there is a certain risk of personal injury when operators inspect in the complex environment. Therefore, intelligent image recognition technology is used for analysis and judgment. First, the operator is prompted to the degree of bending of the auxiliary gun, and second, whether the auxiliary gun is ready to be lowered at the measuring position.

[0054] like Figure 2As shown, when the bending degree of the auxiliary gun of the steelmaking converter is detected by using the detection system for the bending degree of the auxiliary gun provided in the embodiment of the present application, the first camera 2 is installed on the east or west side of the auxiliary gun muzzle 4, and the second camera 3 is installed on the south or north side of the auxiliary gun muzzle 4, to ensure that both cameras can detect the complete auxiliary gun probe 1, and the two cameras are of the same model, with horizontal lenses and perpendicular to each other. Take a new, unbent auxiliary gun, connect the auxiliary gun probe 1, and rotate it to the measuring position, that is, the auxiliary gun is facing the auxiliary gun muzzle 4, the auxiliary gun body is vertical, and the connecting line of the starting point and the end point of the connected auxiliary gun probe 1 is also vertical. At this time, the first camera 2 and the second camera 3 respectively identify the first standard image and the second standard image of the auxiliary gun probe 1, and program through the management server to store the first standard image and the second standard image.

[0055] During the use of the auxiliary gun, if deformation occurs, the auxiliary gun probe 1 connected to the gun body connector will no longer be vertical. Each time the auxiliary gun rotates to the measuring position, before the gun is lowered, the auxiliary gun probe 1 is subjected to object recognition, and the recognized image is programmed in the management server. The first camera 2 detects the degree of curvature from north to south. The starting point and the end point of the probe on the auxiliary gun are connected to form a first comparison image, which forms an angle with the vertical line of the first standard image. If the angle is less than or equal to 40 degrees, the gun can be lowered at the measuring position; the second camera 3 detects the degree of curvature from east to west. The starting point and the end point of the probe on the auxiliary gun are connected to form a second comparison image, which forms an angle with the vertical line of the second standard image. If the angle is less than or equal to 40 degrees, the gun can be lowered at the measuring position. That is, if the angles between the first camera 2 and the second camera 3 and the vertical line are both less than or equal to 40 degrees, the gun can be lowered at the measuring position; if any of the angles between the first camera 2 and the second camera 3 and the vertical line is greater than 40 degrees, the gun cannot be lowered at the measuring position. The choice of angle depends on the length of the auxiliary gun probe 1 and the size of the auxiliary gun muzzle 4 actually used on site.

[0056] In order not to affect production, select any one of the angles between the first camera 2 and the second camera 3 and the vertical line greater than 35 degrees and less than or equal to 40 degrees. When it is in this angle range, the gun can continue to be lowered, but an alarm prompt will be prompted for the handling or replacement of the auxiliary gun body to avoid being unable to lower the gun at the measuring position when it is directly greater than 40 degrees.

[0057] Embodiment 2

[0058] Another aspect of the present application embodiment provides a method for detecting the bending degree of a steelmaking converter auxiliary lance, which is applied to the above-mentioned steelmaking converter auxiliary lance bending degree detection system, comprising:

[0059] Step S1: before the auxiliary gun is put into use, standard image information of the auxiliary gun probe 1 is collected;

[0060] Step S2: After the auxiliary gun is put into use, the comparative image information of the auxiliary gun probe 1 is collected;

[0061] Step S3: Compare and analyze the comparison image information with the standard image information to obtain an analysis result;

[0062] Step S4: Automatically control whether the auxiliary gun at the measuring position continues to lower the gun according to the analysis result.

[0063] Wherein, step S1: before the auxiliary gun is put into use, collecting standard image information of the auxiliary gun probe 1 includes:

[0064] Step S11: before the auxiliary gun is put into use, take a new, unbent auxiliary gun, connect the auxiliary gun to the auxiliary gun probe 1, and rotate it to the measuring position, that is, the auxiliary gun faces the auxiliary gun muzzle 4, and the auxiliary gun body is vertical;

[0065] Step S12: collecting the first standard image information of the line connecting the starting point to the end point of the auxiliary gun probe 1 on the east side or the west side of the auxiliary gun probe 1;

[0066] Step S13: collecting the second standard image information of the line connecting the starting point and the end point of the auxiliary gun probe 1 on the north side or the south side of the auxiliary gun probe 1.

[0067] Step S2: After the auxiliary gun is put into use, the comparison image information of the auxiliary gun probe 1 is collected, including:

[0068] Step S21: During the use of the auxiliary gun, if deformation occurs, the auxiliary gun probe 1 will no longer be vertical, and when a certain degree of deformation is reached, the auxiliary gun is rotated to the measuring position without lowering the gun;

[0069] Step S22: collecting first comparative image information of a line connecting the starting point to the end point of the auxiliary gun probe 1 on the east side or the west side of the auxiliary gun probe 1;

[0070] Step S23: collecting second comparison image information of the line connecting the starting point and the end point of the auxiliary gun probe 1 on the north side or the south side of the auxiliary gun probe 1.

[0071] Step S3: Comparing and analyzing the comparison image information with the standard image information, and obtaining the analysis results includes:

[0072] Step S31: calculating the angle formed by the connecting line in the first standard image information and the connecting line in the first comparative image information to obtain a first angle;

[0073] Step S32: calculating the angle formed by the connecting line in the second standard image information and the connecting line in the second comparative image information to obtain a second angle;

[0074] Step S33: When any one of the first angle and the second angle is greater than 35 degrees and less than or equal to 40 degrees, an alarm message is issued, and a signal is given to process or replace the auxiliary gun body;

[0075] Step S34: When either the first angle or the second angle is greater than 40 degrees, an alarm message is issued, and a signal is given to process or replace the auxiliary gun body, and the gun cannot be lowered;

[0076] Step S35: receiving a high level signal of the measuring position limit, and giving a signal allowing the gun to be lowered when the first angle and the second angle are less than or equal to 40 degrees;

[0077] Step S36: receiving the measurement position limit high level signal, and when the first angle and the second angle are greater than 40 degrees, giving a signal that does not allow the gun to be lowered.

[0078] Step S4: Automatically controlling whether the auxiliary gun at the measuring position continues to lower the gun according to the analysis result includes:

[0079] Step S41: after receiving a signal for processing or replacing the auxiliary gun body, processing or replacing the auxiliary gun body;

[0080] Step S42: after receiving a signal indicating that the auxiliary gun body is to be processed or replaced and the gun cannot be lowered, the auxiliary gun body is processed or replaced, and the auxiliary gun is not lowered;

[0081] Step S43: after receiving the gun lowering permission signal, lowering the auxiliary gun;

[0082] Step S44: after receiving the signal that does not allow the gun to be lowered, the auxiliary gun is not lowered.

[0083] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0084] The image recognition technology is used to analyze and compare the starting and ending positions of the auxiliary gun probe 1, indicating the degree of bending of the auxiliary gun, reminding the operator to deal with or replace the auxiliary gun in time, so as to avoid the auxiliary gun being inserted outside the auxiliary gun muzzle 4 when measuring the lower gun, causing measurement failure and auxiliary gun damage, and affecting production. The full electronic process reduces the workload of operators, reduces the probability of personal injury, reduces the equipment failure rate, and improves production efficiency.

[0085] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A detection system for the bending degree of the auxiliary lance of a steelmaking converter. It is characterized in that include: A secondary gun probe, the secondary gun probe is connected to the disassembled part of the secondary gun; A measuring position limiter, the measuring position limiter is used to limit the auxiliary gun probe to the measuring position; A signal acquisition device, the signal acquisition device is used to acquire image information of the auxiliary gun probe; A signal processing device, the signal processing device is used to receive the image information, analyze the image information to obtain an image display interface, and then output the analysis result; A signal control device, the signal control device is used to automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result; Wherein, the signal acquisition device comprises: A first camera, which is arranged on the east or west side of the auxiliary gun muzzle, and is used to collect image information of the auxiliary gun probe bending in the north-south direction; A second camera, the second camera is arranged on the north side or the south side of the auxiliary gun muzzle, and the second camera is used to collect image information of the auxiliary gun probe bending in the east-west direction; The first camera and the second camera are of the same model, and the lenses are arranged horizontally and perpendicular to each other; Before the auxiliary gun is put into use, the second camera collects the first standard image information of the line connecting the starting point and the end point of the auxiliary gun probe in the north-south direction of the auxiliary gun probe; The first camera collects second standard image information of a line connecting the starting point and the end point of the auxiliary gun probe in the east-west direction of the auxiliary gun probe; After the auxiliary gun is put into use, the second camera collects first comparative image information of a line connecting the starting point and the end point of the auxiliary gun probe in the north-south direction of the auxiliary gun probe; The first camera collects second comparative image information of a line connecting the starting point and the end point of the auxiliary gun probe in the east-west direction of the auxiliary gun probe; The signal processing device comprises: A management server, the management server is used to receive the image information collected by the first camera and the second camera, analyze the image information to obtain an image display interface, and then output the analysis result; A Wincc host computer, the Wincc host computer is used to receive the analysis result and send the analysis result to the signal control device; The management server calculates an angle formed by a connecting line in the first standard image information and a connecting line in the first comparison image information to obtain a first angle; The management server calculates an angle formed by a connecting line in the second standard image information and a connecting line in the second comparison image information to obtain a second angle; When any one of the first angle and the second angle is greater than 35 degrees and less than or equal to 40 degrees, the management server issues an alarm message and gives a signal to process or replace the auxiliary gun body; When any one of the first angle and the second angle is greater than 40 degrees, the management server issues an alarm message and gives a signal to process or replace the auxiliary gun body and cannot lower the gun; Receiving a measurement position limit high level signal, when the first angle and the second angle are less than or equal to 40 degrees, the management server gives a signal allowing the gun to be lowered; A measurement position limit high level signal is received, and when the first angle and the second angle are greater than 40 degrees, the management server gives a signal that does not allow the gun to be lowered.

2. The detection system for the bending degree of the steelmaking converter auxiliary lance according to claim 1, Features: The signal control device is a PLC, and the PLC is used to receive the analysis result sent by the Wincc host computer, and automatically control whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result.

3. A method for detecting the bending degree of a steelmaking converter auxiliary lance, applied to the detection system for the bending degree of a steelmaking converter auxiliary lance according to claim 2, It is characterized in that include: Before the auxiliary gun is put into use, standard image information of the auxiliary gun probe is collected; After the auxiliary gun is put into use, the comparative image information of the auxiliary gun probe is collected; Comparing and analyzing the comparison image information with the standard image information to obtain an analysis result; Automatically controlling whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result; Before the auxiliary gun is put into use, the standard image information of the auxiliary gun probe is collected including: Before the auxiliary gun is put into use, take a new, unbent auxiliary gun, connect the auxiliary gun to the auxiliary gun probe, and rotate it to the measuring position, that is, the auxiliary gun faces the auxiliary gun muzzle and the auxiliary gun body is vertical; Collecting the first standard image information of the line connecting the starting point and the end point of the auxiliary gun probe in the north-south direction of the auxiliary gun probe; Collecting the second standard image information of the line connecting the starting point and the end point of the auxiliary gun probe in the east-west direction of the auxiliary gun probe; After the auxiliary gun is put into use, collecting the comparative image information of the auxiliary gun probe includes: Collecting first comparative image information of a line connecting the starting point and the end point of the auxiliary gun probe in the north-south direction of the auxiliary gun probe; Collecting second comparative image information of a line connecting the starting point and the end point of the auxiliary gun probe in the east-west direction of the auxiliary gun probe; Comparing and analyzing the comparison image information with the standard image information to obtain the analysis result includes: Calculate the angle formed by the connecting line in the first standard image information and the connecting line in the first comparison image information to obtain a first angle; Calculate the angle formed by the connecting line in the second standard image information and the connecting line in the second comparison image information to obtain a second angle; When any one of the first angle and the second angle is greater than 35 degrees and less than or equal to 40 degrees, an alarm message is issued, and a signal is given to process or replace the gun body of the auxiliary gun; When any one of the first angle and the second angle is greater than 40 degrees, an alarm message is issued, and a signal is given to process or replace the auxiliary gun body, and the gun cannot be lowered; Receive a high-level signal of the measuring position limit, and when the first angle and the second angle are less than or equal to 40 degrees, give a signal allowing the gun to be lowered; A high level signal of the measuring position limit is received, and when the first angle and the second angle are greater than 40 degrees, a signal not allowing the gun to be lowered is given.

4. The method for detecting the bending degree of the auxiliary lance of the steelmaking converter according to claim 3, It is characterized in that Automatically controlling whether the auxiliary gun at the measuring position continues to perform the gun lowering operation according to the analysis result includes: After receiving a signal for processing or replacing the auxiliary gun body, processing or replacing the auxiliary gun body; After receiving a signal indicating that the auxiliary gun body is to be processed or replaced and the gun cannot be lowered, the auxiliary gun body is processed or replaced, and the auxiliary gun is not lowered; After receiving the gun lowering permission signal, performing a gun lowering operation on the auxiliary gun; After receiving the gun lowering not allowed signal, the auxiliary gun is not lowered.

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