Image acquisition method

Abstract

The invention discloses an image acquisition method which comprises the following steps: S1, a coke pushing stage: uniformly increasing the air inlet speed of a cooling tower, reducing the air inlet temperature of the cooling tower, enabling the angle interval of a forward inclination angle a to be more than 0 degree and less than 90 degrees, and enabling a pushing unit to drive the cooling tower on a coke pushing rod to move for one forward step pitch at a time; continuously increasing the air inlet speed of the cooling tower to increase the rotation driving acting force of the acquisition lens, wherein the backward acquisition angle b is 90 degrees; according to the method, the acquisition angle of the lens is improved, under the condition of forward step pitch start-stop circulating motion, small step pitch motion is adopted in the coke pushing stage, meanwhile, the three-dimensional edge expressive force of an image acquired at a small inclination angle is higher, and under the condition that the lens and an algorithm are not changed, subtle furnace wall three-dimensional shape change can still be found; therefore, the image processing precision is indirectly improved. And in the returning state, the large-step-pitch returning step pitch is adopted for resetting.

Description

Technical Field

[0001] The invention relates to the field of image technology, and in particular to an image acquisition method. Background Art

[0002] During the coke pushing process, the condition of the coke oven body deteriorates with the increase of usage time, the furnace wall becomes rough and has many caves, and wedge problems are prone to occur during coal loading, resulting in large resistance to coke pushing. During the coke pushing process, due to problems with the wedge structure, the edge of the hole is easily stretched and deformed during movement to form a slightly convex structure, at which time a reverse wedge structure is formed, and the reverse wedge will always act on the side of the coke cake, continuously increasing the resistance to coke cake pushing, which is eventually solved by stripping the coke.

[0003] A Chinese patent discloses a coke oven status acquisition system during the coke pushing process, and its publication number is (CN118109213B). The patent can use the cooling wind speed to adjust the control of the image acquisition lens rotation, so that the image acquisition lens rotates to vertically acquire the furnace wall image. The image can be processed by image processing to analyze abnormal points, thereby detecting the furnace wall to avoid the deterioration of furnace wall problems leading to coke pushing difficulties. For three-dimensional deformation, such as convex and concave problems, the image effect during the vertical detection process is not obvious for convex and concave problems. If you want to check more subtle changes, you need to introduce high-precision algorithms with high-definition images to capture and process subtle problems.

[0004] The above shows that high-definition images are needed, but there is another problem in the process of pushing focus. When the pushing focus rod has a strong creeping degree, it will produce large-scale jumps. The cooling tower is set on the pushing focus rod. When the pushing focus rod has large-scale jumps, the collection lens on the cooling tower is vibrated, which affects the image collection effect. Summary of the invention

[0005] The purpose of the present invention is to provide an image acquisition method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An image acquisition method, comprising:

[0008] S1: In the coke pushing stage, the air inlet speed of the cooling tower is evenly increased and the air inlet temperature of the cooling tower is reduced, so that the collection lens before the cooling tower enters the furnace chamber is rotated to a forward tilt angle and locked with the first limiter. The angle range of the forward tilt angle a is 0°<a<90°. The pushing unit drives the cooling tower on the coke pushing rod to move a forward step at a time, where the forward step is the difference between the width of the oblique collection image and the width of the vertical collection image.

[0009] S2: Push rod stage, continue to increase the air inlet speed of the cooling tower to increase the rotational driving force of the acquisition lens, so that the acquisition lens disengages from the first limiter, and the acquisition lens and the second limiter are limited. At this time, the backward acquisition angle b is 90°, and the air inlet temperature of the cooling tower continues to be reduced. The pushing unit drives the cooling tower on the push rod to move a single return step, where the return step is equal to the vertical acquisition image width, and the return step is greater than the forward step.

[0010] As a further solution of the present invention: S11: when the distance between the cooling tower and the furnace chamber is the turning distance, the rotation angle of the acquisition lens reaches the forward tilt angle a and is locked with the first limiter.

[0011] As a further solution of the present invention: S12: after the pushing unit pushes the focus pushing rod once to move a forward step, the pushing stops until the acquisition lens captures a clear image, and then continues to move a forward step to advance in a cycle.

[0012] As a further solution of the present invention: S13: As the coke pushing rod continues to be pushed, until the acquisition unit cannot acquire any furnace wall image, the continuously increasing air intake speed reaches the critical separation speed of the acquisition lens and the first limiter and continues to increase the air intake speed.

[0013] As a further solution of the present invention: S21: when the vertical collection lens cannot collect any furnace wall image, the cooling tower stops air intake, and the collection lens reverses and disengages from the second limiter and the first limiter in turn, and at this time the collection lens is aligned with the furnace chamber.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention improves the acquisition angle of the lens. In the case of forward step start-stop cycle motion, a small step motion is adopted in the focus pushing stage, and the stability of the acquisition lens can still be guaranteed under the slight vibration of the slow crawling of the focus pushing. At the same time, the three-dimensional edge expression of the image collected at a small tilt angle is stronger. Without changing the lens and algorithm, the subtle three-dimensional morphological changes of the furnace wall can still be found, thereby indirectly improving the image processing accuracy. In the retracted state, a large step return step is used for resetting, and a secondary inspection is performed through vertical image acquisition to further improve the acquisition effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A focus lever motion diagram for an image acquisition method;

[0018] Figure 2 A comparison diagram of image width at a forward tilt angle and vertically acquired image width in an image acquisition method;

[0019] Figure 3 A schematic diagram of vertical acquisition of an image acquisition method;

[0020] Figure 4 A schematic diagram of tilted acquisition of an image acquisition method;

[0021] Figure 5 A micro-convex simulation diagram at a vertical angle in an image acquisition method;

[0022] Figure 6 A micro-convex simulation diagram at an inclined angle in an image acquisition method;

[0023] Figure 7 A schematic diagram of the rotation of a collection lens in an image collection method;

[0024] Figure 8 A schematic diagram of a rotation limiting structure of a collection lens in an image collection method; DETAILED DESCRIPTION

[0025] See also Figure 1-Figure 8 :

[0026] In this embodiment: S1: in the coke pushing stage, the air inlet speed of the cooling tower is uniformly increased and the air inlet temperature of the cooling tower is reduced, so that the collection lens before the cooling tower enters the furnace chamber is rotated to a forward tilt angle and remains locked with the first limiter. The angle range of the forward tilt angle a is 0°<a<90°, and the pushing unit drives the cooling tower on the coke pushing rod to move a forward step at a time, where the forward step is the difference between the width of the inclined collection image and the width of the vertical collection image.

[0027] In this embodiment: In the focus pushing stage, due to the existence of the focus cake, a slow pushing method is adopted. Although the pushing is slow, it is still affected by the creeping and there will be a slight jumping problem, which affects the image acquisition quality. Therefore, a small step intermittent motion method is adopted to push cyclically. In this stage, in order to enhance the display effect of the convex surface, the tilt angle of the forward stage is between 0°<a<90°. In the image acquisition process, the center of the image is vertically acquired, and the image acquisition angle away from the center has a certain tilt angle. In the vertical stage, the tilt angle of the edge of the image is still large. Please refer to Figure 3 When the lens is tilted, the actual area of ​​the captured image increases, and the tilt angle of the edge becomes smaller. When the tilt angle is closer to 0, the convexity becomes larger. Please refer to Figure 5 and Figure 6 The contrast effect is that when the tilt angle is small, the bulge is more obvious. At this time, when the image is segmented, the boundary features are strengthened, making it easier to find more subtle problems.

[0028] In this embodiment: Please refer to Figure 2 When the image width actually collected by the acquisition lens at the forward tilt angle is larger than the image width collected in the vertical state, since the return step is consistent with the vertical image acquisition width during the resetting process, the forward step selects the difference between the tilt image acquisition width and the vertical image acquisition width. By setting the forward step, the wall image is not within the range of the vertical image acquisition angle, and a smaller angle is used to fully cover the furnace wall, thereby searching for the three-dimensional deformation details of the furnace wall.

[0029] In this embodiment, S11: when the distance between the cooling tower and the furnace chamber is the turning distance, the rotation angle of the collection lens reaches the forward inclination angle a and is locked with the first limit switch, S12: after the pushing unit pushes the focus pushing rod once to move a forward step, it stops pushing until the collection lens captures a clear image, and then continues to move a forward step to move forward in a cycle.

[0030] In this embodiment, a raised block is provided on the inner wall of the ring body in which the lens rotates. The middle part of the block is concave and the two sides are arc-shaped. When the collecting lens drives the ring body to rotate, the protrusion of the center column first enters the concave area through the edge of the block. In this area, the raised block and the protrusion of the center column require a larger wind speed to separate. At this stage, through the interaction between the wind and the first limiter, after a single forward step, even if a slight vibration occurs, the lens can still be quickly stabilized by the first limiter at the stop stage. The raised block can be made of rubber material for vibration energy absorption, which can stabilize the lens.

[0031] In this embodiment, S13: as the coke pushing rod continues to be pushed, until the acquisition unit cannot acquire any furnace wall image, the continuously increasing air intake speed reaches the critical separation speed of the acquisition lens and the first limiter and continues to increase.

[0032] In this embodiment, S2: the pushing rod stage, the air inlet speed of the cooling tower is continued to increase to increase the rotational driving force of the collection lens, so that the collection lens is disengaged from the first limiter, and the collection lens is limited by the second limiter. At this time, the backward collection angle b is 90°, and the air inlet temperature of the cooling tower is continued to be reduced. The pushing unit drives the cooling tower on the pushing rod to move a single return step, wherein the return step is equal to the vertical collection image width, and the return step is greater than the forward step.

[0033] In this embodiment, please refer to Figure 2When there is no furnace wall in the image at an inclined angle, the furnace wall has entered the acquisition area of ​​the vertical image. Therefore, when the air intake speed reaches the critical speed for separation between the acquisition lens and the first limiter and continues to increase, the first limiter is separated and the position is limited by the second limiter. The second limiter is a block. In the retraction stage, a single-step multiple-retraction form is adopted, and the furnace wall is collected for the second time through the reverse step, so as to obtain a more detailed and accurate image. At the same time, the temperature of the cooling tower has risen due to the residence time in the furnace. At this time, fast and efficient cooling is more important. In this stage, high-speed and low-temperature wind is used to enhance the cooling of the cooling tower.

[0034] In this embodiment, S21: when the vertical collection lens cannot collect any furnace wall image, the cooling tower stops air intake, and the collection lens reverses and disengages from the second stopper and the first stopper in sequence. At this time, the collection lens is aligned with the furnace chamber.

[0035] In this embodiment, a rotating spring is used inside the collection lens to achieve resetting, and the elastic force applied by the rotating spring to the collection lens can achieve the separation of the first limiter and the second limiter.

[0036] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An image acquisition method, characterized in that: include: S1: In the coke pushing stage, the air inlet speed of the cooling tower is evenly increased and the air inlet temperature of the cooling tower is reduced, so that the collection lens before the cooling tower enters the furnace chamber is rotated to a forward tilt angle and locked with the first limiter. The angle range of the forward tilt angle a is 0°<a<90°. The pushing unit drives the cooling tower on the coke pushing rod to move a forward step at a time, where the forward step is the difference between the width of the oblique collection image and the width of the vertical collection image. S2: Push rod stage, continue to increase the air inlet speed of the cooling tower to increase the rotational driving force of the acquisition lens, so that the acquisition lens disengages from the first limiter, and the acquisition lens and the second limiter are limited. At this time, the backward acquisition angle b is 90°, and the air inlet temperature of the cooling tower continues to be reduced. The pushing unit drives the cooling tower on the push rod to move a single return step, where the return step is equal to the vertical acquisition image width, and the return step is greater than the forward step.

2. An image acquisition method according to claim 1, characterized in that: S11: When the distance between the cooling tower and the furnace chamber is the turning distance, the rotation angle of the acquisition lens reaches the forward tilt angle a and is locked with the first limiter.

3. The image acquisition method according to claim 1, characterized in that: S12: After the pushing unit pushes the focus pushing rod once to move a forward step, the pushing stops until the acquisition lens acquires a clear image, and then the focus pushing rod continues to move a forward step to cycle forward.

4. The image acquisition method according to claim 1, characterized in that: S13: As the coke pushing rod continues to be pushed, until the acquisition unit cannot acquire any furnace wall image, the continuously increasing air intake speed reaches the critical separation speed of the acquisition lens and the first stopper and continues to increase.

5. The image acquisition method according to claim 1, characterized in that: S21: When the vertical collection lens cannot collect any furnace wall images, the cooling tower stops air intake, and the collection lens reverses and disengages from the second stopper and the first stopper in turn. At this time, the collection lens is aligned with the furnace chamber.

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