Coke oven chute opening adjusting structure and adjusting method

Abstract

The invention relates to a coke oven chute opening adjusting structure and method, a chute opening is provided with an adjusting brick groove, the adjusting brick groove is composed of a sliding adjusting groove section and a reverse pushing groove section, a sliding adjusting brick is arranged in the adjusting brick groove, and the sliding adjusting brick is moved through a tool adjusting brick; during adjustment, the tool adjusting brick is arranged in a sliding adjusting groove section between the sliding adjusting brick and the nose bridge brick or a reverse pushing groove section at the other end of the sliding adjusting brick, and the sliding adjusting brick is moved by means of the self weight of the tool adjusting brick; a fixed-distance section is arranged on the tool adjusting brick, and the size of the fixed-distance section is the horizontal distance between the sliding adjusting brick and the nose bridge brick after the sliding adjusting brick moves in place, namely the opening degree of the chute opening; adjusting precision is high, and operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of coke oven technology, and in particular to a coke oven inclined chute adjustment structure and adjustment method. Background Technology

[0002] Each combustion chamber of a coke oven is connected to a regenerator via a bottom inclined duct. The duct opening is the throat through which air or lean gas enters the combustion chamber. The opening area of ​​the duct directly determines the gas flow rate and velocity entering the corresponding vertical flue, and directly affects the temperature of the vertical flue. After long-term operation, due to masonry deformation, blockage (silica brick erosion, graphite deposition, debris), etc., the actual area of ​​each inclined duct opening will change, resulting in uneven airflow distribution. To ensure the uniformity of longitudinal heating in the combustion chamber, the opening area of ​​the inclined duct opening needs to be adjusted to ensure uniform coke maturation, thereby improving product quality and helping to reduce energy consumption and extend the oven's lifespan.

[0003] Currently, the adjustment of the inclined duct opening area is mainly achieved by replacing or adjusting the number of adjusting bricks. Specifically, a special adjusting brick placement tool is used, which is inserted downwards into the vertical flue through the observation hole at the top of the combustion chamber to place adjusting bricks of a set thickness at the inclined duct opening, or by adjusting the number of adjusting bricks at the inclined duct opening. As coke ovens continue to develop towards larger sizes and the height of the combustion chamber continues to increase, the difficulty of using this adjustment method is also increasing. Summary of the Invention

[0004] This invention provides a coke oven inclined chute adjustment structure and method. A sliding adjustment brick is set at the inclined chute, and the position of the sliding adjustment brick is precisely adjusted by using a tool adjustment brick, thereby precisely adjusting the opening of the inclined chute. The adjustment accuracy is high and the operation is more convenient.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A coke oven inclined chute adjustment structure includes an adjustment brick groove at the inclined chute, comprising a sliding adjustment groove section and a reverse thrust groove section. A sliding adjustment brick is placed within the groove and can move along it. The opening of the inclined chute changes accordingly when the sliding adjustment brick reaches the sliding adjustment groove section. The movement of the sliding adjustment brick is achieved via a tool adjustment brick. The tool adjustment brick is placed in the adjustment brick groove only when adjusting the opening of the inclined chute. During adjustment, the tool adjustment brick is placed in the sliding adjustment groove section between the sliding adjustment brick and the nose bridge brick, or in the reverse thrust groove section at the other end of the sliding adjustment brick, and moves by its own weight. The tool adjustment brick has a fixed distance section, the size of which is the horizontal distance between the sliding adjustment brick and the nose bridge brick after the sliding adjustment brick has moved into position, i.e., the opening of the inclined chute. Various specifications of tool adjustment bricks are pre-made for selection based on different sizes of the fixed distance section. During adjustment, the tool adjustment brick is inserted through the observation hole at the top of the combustion chamber using an adjustment rod.

[0006] The projection of the sliding adjusting brick in the width direction is T-shaped. The upper two protruding sections are support shoulders that cooperate with the top surfaces of the masonry on both sides of the adjusting brick groove, and the lower two sections are side positioning surfaces that cooperate with the sides of the adjusting brick groove. The two ends of the sliding adjusting brick in the length direction are respectively provided with surfaces that cooperate with the tool adjusting brick. The projection of the tool adjusting brick in the width direction is also T-shaped. The upper two protruding sections are support shoulders that cooperate with the top surfaces of the masonry on both sides of the adjusting brick groove, and the lower two sections are side positioning surfaces that cooperate with the sides of the adjusting brick groove. One end of the tool adjusting brick in the length direction is provided with a surface that cooperates with the sliding adjusting brick, and the other end is provided with a surface that cooperates with the nose bridge brick.

[0007] The sliding adjustment brick has an airflow side mating surface one at the top and an airflow side mating surface two at the bottom at the top, and a reverse push side mating surface at the top at the other end; the tool adjustment brick has a vertical surface at the top and a nose bridge brick mating surface at the bottom, and a sliding adjustment brick mating surface one at the top and a sliding adjustment brick mating surface two at the bottom at the other end.

[0008] The intersection of the facade and the mating surface of the nose bridge brick is the reference point. The intersection of the horizontal line drawn from the reference point and the second mating surface of the sliding adjustment brick at the other end is the distance point. The distance between the reference point and the distance point is the distance segment.

[0009] The bottom of the first support shoulder is provided with multiple spherical protrusions, and the bottom of the second support shoulder is provided with multiple spherical protrusions.

[0010] The bottom of the support shoulder is provided with multiple grooves, in which columnar or spherical rolling elements are embedded. The material of the rolling elements is the same as that of the sliding adjustment brick.

[0011] The tool adjustment brick is made of zero-expansion silica brick or silicon carbide material.

[0012] The end face of the adjusting brick groove away from the nose bridge brick has a shape that matches the sliding adjusting brick mating surface one and the sliding adjusting brick mating surface two on the tool adjusting brick.

[0013] A method for adjusting the inclined chute of a coke oven includes: 1) During the construction of the inclined coke oven, the adjusting brick trough is built simultaneously. The adjusting brick trough consists of a sliding adjusting trough section and a reverse pushing trough section. The sliding adjusting brick is placed in the initial position set in the adjusting brick trough. At this time, the opening of the inclined trough is the initial opening. 2) After the coke oven starts up, the coke oven temperature measurement system monitors the temperature of each flue in the combustion chamber of the whole oven in real time, finds unreasonable temperature distribution points, and determines the inclined flue that needs to be adjusted, i.e. the target inclined flue. 3) Determine the location of the combustion chamber and fire channel corresponding to each target ramp, the adjustment direction and adjustment amount of the sliding adjustment brick at the ramp, and prepare tool adjustment bricks with the same distance section size and adjustment amount; 4) Adjusting the target ramp opening: Open the observation hole at the top of the fire channel corresponding to the target ramp opening, and use the adjusting rod to place the corresponding tool adjusting brick at one end of the sliding adjusting brick; when it is necessary to increase the ramp opening, place the tool adjusting brick in the adjusting brick groove between the nose bridge brick and the sliding adjusting brick. Through the inclined surface that cooperates with the nose bridge brick and the sliding adjusting brick, the vertical gravity of the tool adjusting brick is converted into a horizontal thrust to push the sliding adjusting brick to move. After the tool adjusting brick moves down to the position, the fixed distance section automatically adjusts the sliding adjusting brick into position; when it is necessary to decrease the ramp opening, first place the tool adjusting brick with the maximum fixed distance section size in the reverse thrust groove section at the other end of the sliding adjusting brick. Through the inclined surface that cooperates with the adjusting brick groove and the sliding adjusting brick, move the sliding adjusting brick to the limit position close to the nose bridge brick. Then place the tool adjusting brick with the adjustable fixed distance section size between the nose bridge brick and the sliding adjusting brick to adjust the sliding adjusting brick into position.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1) A new approach to coke oven firing is proposed, in which a sliding adjusting brick is set in the adjusting brick groove at the inclined chute, and the position of the sliding adjusting brick is precisely adjusted by using a tool to adjust the brick, thereby precisely adjusting the opening of the inclined chute.

[0015] 2) Conventional methods of increasing or decreasing the number of adjusting bricks or replacing adjusting bricks of different thicknesses require newly placed adjusting bricks to undergo rapid cooling and heating processes from room temperature to working temperature (around 1300℃) or from working temperature to room temperature, which seriously affects the service life of the adjusting bricks and makes them prone to breakage and damage. This invention effectively avoids the occurrence of the above problems. 3) Conventional methods of increasing or decreasing the number of adjusting bricks or replacing adjusting bricks of different thicknesses are prone to problems such as uneven placement or misalignment during the placement of adjusting bricks. Not only is the adjustment accuracy poor, but the adjustment process is also complicated and difficult to operate. In contrast, the adjustment process of the present invention is simple and easy to operate. After the tool is placed and the adjusting brick is adjusted, the sliding adjusting brick automatically enters the position without manual adjustment. 4) The sliding adjusting brick and the adjusting brick positioning groove can adopt a rolling contact method. Compared with the sliding contact method, the friction during the movement is greatly reduced, which further reduces the difficulty of operation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a coke oven inclined chute adjustment structure according to the present invention.

[0017] Figure 1a yes Figure 1 Front view sectional view.

[0018] Figure 1b yes Figure 1a Top view.

[0019] Figure 2 A three-dimensional structural diagram of the sliding adjustment brick described in this invention.

[0020] Figure 2a yes Figure 2 The main view.

[0021] Figure 2b yes Figure 2a Top view.

[0022] Figure 2c yes Figure 2a The left view.

[0023] Figure 3 A three-dimensional structural diagram of the tool adjusting brick described in this invention.

[0024] Figure 3a yes Figure 2 The main view.

[0025] Figure 3b yes Figure 3a Top view.

[0026] Figure 3c yes Figure 3a The left view.

[0027] In the diagram: 1. Inclined ramp 11. Inclined ramp opening 2. Nose bridge brick 3. Sliding adjustment groove section 4. Reverse thrust groove section 5. Sliding adjustment brick 51. Airflow side mating surface one 52. Airflow side mating surface two 53. Reverse thrust side mating surface 54. Support shoulder one 55. Spherical protrusion one 56. Side positioning surface one 6. Tool adjustment brick 61. Elevation 62. Nose bridge brick mating surface 63. Sliding adjustment brick mating surface one 64. Sliding adjustment brick mating surface two 65. Support shoulder two 66. Spherical protrusion two 67. Side positioning surface two Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings: like Figure 1 , Figure 1a , Figure 1b As shown, the coke oven inclined chute adjustment structure of the present invention includes an adjusting brick groove at the inclined chute 11, which is composed of a sliding adjusting groove section 3 and a reverse pushing groove section 4. A sliding adjusting brick 5 (such as...) is provided in the adjusting brick groove. Figure 2 , Figures 2a-2c As shown), the sliding adjusting brick 5 can move along the adjusting brick groove. When the sliding adjusting brick 5 moves to the sliding adjusting groove section 3, the opening of the inclined chute 11 changes accordingly. The movement of the sliding adjusting brick 5 is controlled by the tool adjusting brick 6 (such as...). Figure 3 , Figures 3a-3cAs shown in the figure; the tool adjusting brick 6 is placed in the adjusting brick groove only when adjusting the opening of the inclined chute 11. During adjustment, the tool adjusting brick 6 is placed in the sliding adjusting groove section 3 between the sliding adjusting brick 5 and the nose bridge brick 2 or in the reverse pushing groove section 4 at the other end of the sliding adjusting brick 5, and the sliding adjusting brick 5 is moved by its own weight; the tool adjusting brick 6 is provided with a fixed distance section, the size of which is the horizontal distance between the sliding adjusting brick 5 and the nose bridge brick 2 after the sliding adjusting brick 5 is moved into place, that is, the opening of the inclined chute 11; various specifications of tool adjusting bricks 6 are prefabricated according to different sizes of the fixed distance section for selection; during adjustment, the tool adjusting brick 6 is inserted into the observation hole at the top of the combustion chamber using the adjusting rod.

[0029] like Figure 2 , Figures 2a-2c As shown, the projection of the sliding adjusting brick 5 in the width direction is T-shaped. The upper two extended sections are support shoulders 54 that cooperate with the top surfaces of the masonry on both sides of the adjusting brick groove, and the lower two sides are side positioning surfaces 56 that cooperate with the sides of the adjusting brick groove; the two ends of the sliding adjusting brick 5 in the length direction are respectively provided with surfaces that cooperate with the tool adjusting brick 6; as shown Figure 3 , Figures 3a-3c As shown, the projection of the tool adjusting brick 6 in the width direction is also T-shaped. The upper two sides of the extended section are support shoulders 65 that cooperate with the top surface of the masonry on both sides of the adjusting brick groove. The lower two sides are side positioning surfaces 67 that cooperate with the side of the adjusting brick groove. One end of the tool adjusting brick 6 in the length direction is provided with a surface that cooperates with the sliding adjusting brick 5, and the other end is provided with a surface that cooperates with the nose bridge brick 2.

[0030] The sliding adjustment brick 5 has an airflow side mating surface 51 at the upper part of one end along its length and an airflow side mating surface 52 at the lower part, and a reverse push side mating surface 53 at the upper part of the other end; the tool adjustment brick 6 has a mating surface 61 at the upper part of one end along its length and a nose bridge brick mating surface 62 at the lower part, and a sliding adjustment brick mating surface 63 at the upper part of the other end and a sliding adjustment brick mating surface 64 at the lower part.

[0031] The intersection of the facade 61 and the mating surface 62 of the nose bridge brick is the reference point. The intersection of the horizontal line drawn from the reference point and the mating surface 64 of the sliding adjustment brick at the other end is the distance point. The distance between the reference point and the distance point is the distance segment. Figure 3a The dimension indicated is H).

[0032] The bottom of the support shoulder 54 is provided with multiple spherical protrusions 55, and the bottom of the support shoulder 65 is provided with multiple spherical protrusions 66.

[0033] The bottom of the support shoulder 54 is provided with multiple grooves, in which columnar or spherical rolling elements are embedded. The material of the rolling elements is the same as that of the sliding adjustment brick 5.

[0034] The tool adjusting brick 6 is made of zero-expansion silicon brick or silicon carbide material.

[0035] The end face of the adjusting brick groove away from the nose bridge brick 2 has a shape that matches the sliding adjusting brick mating surface 63 and the sliding adjusting brick mating surface 64 on the tool adjusting brick 6.

[0036] The coke oven inclined chute adjustment method of the present invention includes: 1) When constructing the inclined chute 1 of the coke oven, the adjusting brick trough is built simultaneously. The adjusting brick trough consists of a sliding adjusting trough section 3 and a reverse pushing trough section 4. The sliding adjusting brick 5 is placed in the initial position set in the adjusting brick trough. At this time, the opening of the inclined chute 11 is the initial opening. 2) After the coke oven starts up, the coke oven temperature measurement system monitors the temperature of each flue in the combustion chamber of the whole oven in real time, finds unreasonable temperature distribution points, and determines the inclined flue that needs to be adjusted, i.e. the target inclined flue. 3) Determine the location of the combustion chamber and fire channel corresponding to each target ramp, the adjustment direction and adjustment amount of the sliding adjustment brick at the ramp, and prepare tool adjustment bricks with the same distance section size and adjustment amount; 4) Adjusting the target ramp opening: Open the observation hole at the top of the fire channel corresponding to the target ramp opening, and use the adjusting rod to place the corresponding tool adjusting brick 6 at one end of the sliding adjusting brick 5; when it is necessary to increase the opening of the ramp opening 11, place the tool adjusting brick 6 in the adjusting brick groove between the nose bridge brick 2 and the sliding adjusting brick 5. Through the inclined surface that cooperates with the nose bridge brick 2 and the sliding adjusting brick 5, the vertical gravity of the tool adjusting brick 6 is converted into a horizontal thrust to push the sliding adjusting brick 5 to move. After the tool adjusting brick 6 moves down to the position, the fixed distance section automatically adjusts the sliding adjusting brick 5 into position; when it is necessary to decrease the opening of the ramp opening 11, first place the tool adjusting brick 6 with the maximum fixed distance section size in the reverse thrust groove section 4 at the other end of the sliding adjusting brick 5. Through the inclined surface that cooperates with the adjusting brick groove and the sliding adjusting brick 5, move the sliding adjusting brick 5 to the limit position close to the nose bridge brick 2. Then place the tool adjusting brick 6 with the adjustable fixed distance section size between the nose bridge brick 2 and the sliding adjusting brick 5 to adjust the sliding adjusting brick 5 into position.

[0037] The coke oven inclined passage adjustment structure of the present invention adopts a combination of sliding adjustment brick 5 and tool adjustment brick 6. The sliding adjustment brick 5 plays the role of adjusting the opening of the inclined passage 11, while the tool adjustment brick 6 plays the role of pushing and precise positioning when the sliding adjustment brick 5 moves and adjusts (i.e., it is used as an adjustment tool). After the sliding adjustment brick 5 moves into place, the tool adjustment brick 6 needs to be removed from the coke oven.

[0038] Both the sliding adjusting brick 5 and the tool adjusting brick 6 have a T-shaped projection in the width direction. Supporting shoulders on both sides rest on the top of the masonry on either side of the adjusting brick groove, providing support and positioning. Supporting shoulder 54 on the sliding adjusting brick 5 and supporting shoulder 65 on the tool adjusting brick 6 are both high-level positioning surfaces, ensuring that the tool adjusting brick 6 is at the same reference height as the sliding adjusting brick 5 after it has moved into position. Only then can the fixed-distance section on the tool adjusting brick 6 accurately position the sliding adjusting brick 5.

[0039] The sliding adjusting brick 5 can slide along the longitudinal direction (adjustment direction) of the adjusting brick groove. The surface of the sliding adjusting brick 5 facing the nose bridge brick 2 is the airflow contact surface, and the other side (back side) is the reverse thrust surface. Both end faces of the sliding adjusting brick 5 are beveled and both mate with the corresponding surfaces on the tool adjusting brick 6.

[0040] Both ends of the tool adjusting brick 6 are inclined surfaces, which respectively cooperate with the corresponding surfaces of the nose bridge brick 2 and the sliding adjusting brick 5. The working principle of the tool adjusting brick 6 is to use the inclined surface to convert its own weight into a lateral thrust to push the sliding adjusting brick 5 to move.

[0041] Preferably, the bottom of the support shoulder 54 on the sliding adjusting brick 5 can be provided with a spherical protrusion 55 to reduce friction during sliding. Alternatively, the bottom of the support shoulder 54 on the sliding adjusting brick 5 can be provided with a groove, in which a cylindrical or spherical rolling element is embedded, converting the sliding friction of the sliding adjusting brick 5 into rolling friction, further reducing frictional resistance. In order to maintain the same height as the sliding adjusting brick 5 after it has moved to the lower position, a spherical protrusion 66 can also be provided on the tool adjusting brick 6, with the same height as the spherical protrusion 55.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A coke oven inclined chute adjustment structure, characterized in that, The ramp opening is equipped with an adjusting brick groove, which consists of a sliding adjusting groove section and a reverse pushing groove section. A sliding adjusting brick is placed within the adjusting brick groove and can move along it. The opening of the ramp opening changes accordingly when the sliding adjusting brick moves to the sliding adjusting groove section. The movement of the sliding adjusting brick is achieved through a tool adjusting brick. The tool adjusting brick is placed in the adjusting brick groove only when adjusting the ramp opening. During adjustment, the tool adjusting brick is placed in the sliding adjusting groove section between the sliding adjusting brick and the nose bridge brick, or in the reverse pushing groove section at the other end of the sliding adjusting brick, and moves by its own weight. The tool adjusting brick has a fixed-distance section, the size of which is the horizontal distance between the sliding adjusting brick and the nose bridge brick after the sliding adjusting brick has moved into position, i.e., the opening of the ramp opening. Various specifications of tool adjusting bricks are pre-made for selection based on different sizes of the fixed-distance section. During adjustment, the tool adjusting brick is inserted into the observation hole at the top of the combustion chamber using an adjusting rod.

2. The coke oven inclined chute adjustment structure according to claim 1, characterized in that, The projection of the sliding adjusting brick in the width direction is T-shaped. The upper two protruding sections are support shoulders that cooperate with the top surfaces of the masonry on both sides of the adjusting brick groove, and the lower two sections are side positioning surfaces that cooperate with the sides of the adjusting brick groove. The two ends of the sliding adjusting brick in the length direction are respectively provided with surfaces that cooperate with the tool adjusting brick. The projection of the tool adjusting brick in the width direction is also T-shaped. The upper two protruding sections are support shoulders that cooperate with the top surfaces of the masonry on both sides of the adjusting brick groove, and the lower two sections are side positioning surfaces that cooperate with the sides of the adjusting brick groove. One end of the tool adjusting brick in the length direction is provided with a surface that cooperates with the sliding adjusting brick, and the other end is provided with a surface that cooperates with the nose bridge brick.

3. The coke oven inclined chute adjustment structure according to claim 2, characterized in that, The sliding adjustment brick has an airflow side mating surface one at the top and an airflow side mating surface two at the bottom at the top, and a reverse push side mating surface at the top at the other end; the tool adjustment brick has a vertical surface at the top and a nose bridge brick mating surface at the bottom, and a sliding adjustment brick mating surface one at the top and a sliding adjustment brick mating surface two at the bottom at the other end.

4. The coke oven inclined chute adjustment structure according to claim 3, characterized in that, The intersection of the facade and the mating surface of the nose bridge brick is the reference point. The intersection of the horizontal line drawn from the reference point and the second mating surface of the sliding adjustment brick at the other end is the distance point. The distance between the reference point and the distance point is the distance segment.

5. The coke oven inclined chute adjustment structure according to claim 2, characterized in that, The bottom of the first support shoulder is provided with multiple spherical protrusions, and the bottom of the second support shoulder is provided with multiple spherical protrusions.

6. The coke oven inclined chute adjustment structure according to claim 2, characterized in that, The bottom of the support shoulder is provided with multiple grooves, in which columnar or spherical rolling elements are embedded. The material of the rolling elements is the same as that of the sliding adjustment brick.

7. The coke oven inclined chute adjustment structure according to claim 1, characterized in that, The tool adjustment brick is made of zero-expansion silica brick or silicon carbide material.

8. The coke oven inclined chute adjustment structure according to claim 1, characterized in that, The end face of the adjusting brick groove away from the nose bridge brick has a shape that matches the sliding adjusting brick mating surface one and the sliding adjusting brick mating surface two on the tool adjusting brick.

9. A method for adjusting the inclined coke oven chute, based on the inclined coke oven chute adjustment structure as described in any one of claims 1 to 8; characterized in that, include: 1) During the construction of the inclined coke oven, the adjusting brick trough is built simultaneously. The adjusting brick trough consists of a sliding adjusting trough section and a reverse pushing trough section. The sliding adjusting brick is placed in the initial position set in the adjusting brick trough. At this time, the opening of the inclined trough is the initial opening. 2) After the coke oven starts up, the coke oven temperature measurement system monitors the temperature of each flue in the combustion chamber of the whole oven in real time, finds unreasonable temperature distribution points, and determines the inclined flue that needs to be adjusted, i.e. the target inclined flue. 3) Determine the location of the combustion chamber and fire channel corresponding to each target ramp, the adjustment direction and adjustment amount of the sliding adjustment brick at the ramp, and prepare tool adjustment bricks with the same distance section size and adjustment amount; 4) Adjusting the target ramp opening: Open the observation hole at the top of the fire channel corresponding to the target ramp opening, and use the adjusting rod to place the corresponding tool adjusting brick at one end of the sliding adjusting brick; when it is necessary to increase the ramp opening, place the tool adjusting brick in the adjusting brick groove between the nose bridge brick and the sliding adjusting brick. Through the inclined surface that cooperates with the nose bridge brick and the sliding adjusting brick, the vertical gravity of the tool adjusting brick is converted into a horizontal thrust to push the sliding adjusting brick to move. After the tool adjusting brick moves down to the position, the fixed distance section automatically adjusts the sliding adjusting brick into position; when it is necessary to decrease the ramp opening, first place the tool adjusting brick with the maximum fixed distance section size in the reverse thrust groove section at the other end of the sliding adjusting brick. Through the inclined surface that cooperates with the adjusting brick groove and the sliding adjusting brick, move the sliding adjusting brick to the limit position close to the nose bridge brick. Then place the tool adjusting brick with the adjustable fixed distance section size between the nose bridge brick and the sliding adjusting brick to adjust the sliding adjusting brick into position.

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