Sealing structure for crystallizer copper plate thermocouple

Abstract

The invention discloses a sealing structure for a thermocouple of a crystallizer copper plate, which belongs to the technical field of metal solidification, and comprises a crystallizer copper plate, a back plate, a fixing bolt assembly and a sealing gasket, the crystallizer copper plate is connected with the back plate through the fixing bolt assembly, and the bottom of the fixing bolt assembly abuts against the sealing gasket. A bolt mounting hole is formed in the crystallizer copper plate, the sealing gasket is arranged in the bolt mounting hole, a cavity is formed by the bolt mounting hole and the fixing bolt assembly, and the fixing bolt assembly extrudes the sealing gasket and fills the cavity. The sealing gasket is deformed into a shape with a corner in the extrusion process, so that the phenomenon that the sealing gasket is directly extruded to the front end position of the thermocouple and the thermocouple cannot be in contact with a copper plate can be avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of metal solidification, in particular to a sealing structure for a crystallizer copper plate thermocouple. Background Art

[0002] The steel leakage prediction system is widely used in modern large slab continuous casting production. Thermocouple temperature detection here is the key to ensure the accurate operation of the steel leakage prediction system. However, in actual production applications, affected by various factors, thermocouples often cannot accurately measure the temperature of the copper plate of the crystallizer, and water seepage caused by poor sealing of the fixing bolts is the main problem affecting the accuracy of temperature measurement. It will not only generate a large number of false alarms, but may even cause missed alarms, leading to steel leakage accidents. In order to prevent the occurrence of the above problems, metallurgical science and technology workers have done a lot of research work over the years and proposed a variety of technical measures. The focus is on the structural improvement of fixing bolts and sealing gaskets.

[0003] Chinese patent CN201127983Y "A Thermocouple Connection Device" sets a sealing groove at the front end of the hollow sleeve bolt to prevent water from seeping into the front end of the thermocouple, and places an O-type sealing ring in the sealing groove. When in use, the front end of the hollow sleeve bolt presses the copper plate, and the O-type sealing ring is compressed and plays a water sealing role. This method has a simple structure, but due to the small contact area between the O-type sealing ring and the copper plate, the water sealing effect is not very ideal.

[0004] In order to increase the sealing area of ​​the sealing ring, some steel mills use flat sealing rings instead of O-rings. Although this sealing structure increases the contact area between the copper plate and the sealing ring, and between the fixing bolt and the sealing ring, it does not take the deformation behavior of the sealing gasket into consideration, causing the sealing gasket to be directly squeezed to the front end of the thermocouple, making it impossible for the thermocouple to contact the copper plate, affecting the temperature measurement effect. Summary of the invention

[0005] The object of the present invention is to provide a sealing structure for a crystallizer copper plate thermocouple to solve the above-mentioned problems in the prior art.

[0006] A sealing structure for a crystallizer copper plate thermocouple is provided, comprising a crystallizer copper plate, a back plate, a fixing bolt assembly and a sealing gasket, wherein the crystallizer copper plate and the back plate are connected via the fixing bolt assembly, a sealing gasket abuts against the bottom of the fixing bolt assembly, a bolt mounting hole is provided inside the crystallizer copper plate, the sealing gasket is provided in the bolt mounting hole, a cavity is formed between the bolt mounting hole and the fixing bolt assembly, and the fixing bolt assembly squeezes the sealing gasket and fills the cavity.

[0007] As a further embodiment of the present invention: the fixing bolt assembly includes a fixing bolt body, the fixing bolt body is arranged between the crystallizer copper plate and the back plate, a columnar connecting part is arranged at the bottom of the fixing bolt body, the columnar connecting part is arranged with inclined surfaces all around, the columnar connecting part is connected with a conical protrusion through the inclined surfaces, the inclined surfaces between the columnar connecting part and the conical protrusion guide the sealing gasket to deform in a specific direction when subjected to force, the sealing gasket protrudes in the circumferential direction during the extrusion process, and can better fit the inner wall of the bolt mounting hole, further enhancing the sealing effect, the conical protrusion forms a stable supporting structure at the bottom of the fixing bolt body, which can evenly disperse the pressure when subjected to force, and prevent the sealing gasket from tearing or performance degradation due to local uneven force.

[0008] As a further embodiment of the present invention: a first thermocouple mounting hole is arranged inside the fixing bolt body. By integrating the thermocouple with the fixing bolt body, additional mounting components are reduced, and mechanical protection is provided for the thermocouple to prevent it from being damaged during operation or maintenance.

[0009] As a further embodiment of the present invention: the bolt mounting hole includes a bottom plane area, an upper threaded area and a lower columnar area, the upper threaded area is arranged on the copper plate of the crystallizer, the lower columnar area is arranged below the upper threaded area, the bottom plane area is arranged below the lower columnar area, and the upper threaded area is used for the installation of the fixing bolt assembly. Through the threaded connection method, it is ensured that the fixing bolt can be stably installed and withstand mechanical loads and environmental pressure; the lower columnar area provides guidance and support for the fixing bolt assembly, and at the same time leaves space for the deformation of the sealing gasket to optimize the sealing performance; the bottom plane area, as the bottom area of ​​the mounting hole, provides the final plane constraint for the deformation and support of the sealing gasket, ensuring that the sealing gasket is evenly stressed and the sealing is stable.

[0010] As a further embodiment of the present invention: the outer diameter of the lower columnar area is larger than the outer part of the columnar connecting part, and the larger outer diameter of the lower columnar area forms a transition limiting area. When the fixing bolt assembly squeezes the sealing gasket, the deformation of the sealing gasket will be limited by the outer diameter of the lower columnar area.

[0011] As a further embodiment of the present invention: the height of the sealing gasket is S, the thickness of the truncated cone protrusion is H, and the thickness H of the truncated cone protrusion is 40% to 70% of the height S of the sealing gasket, in order to ensure that the compression amount of the sealing gasket by the fixing bolt is fixed and accurate.

[0012] As a further embodiment of the present invention: the sealing gasket is a sealing gasket made of rubber material.

[0013] As a further embodiment of the present invention: a water stop hole is also provided below the bottom plane area. The design of the water stop hole forms a secondary sealing barrier. Even if the sealing gasket leaks for some reason, the water stop hole can prevent the liquid from further spreading or leaking out. Through the graded sealing structure, the water stop hole effectively enhances the anti-seepage performance of the entire system, ensures that the coolant or other media does not penetrate into the external environment, and improves the operating safety of the crystallizer.

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

[0015] In the present invention, the copper plate and the back plate of the crystallizer are connected by a fixing bolt assembly, and a sealing gasket is abutted at the bottom of the fixing bolt assembly. The fixing bolt assembly squeezes the sealing gasket and fills the cavity, which can avoid deformation of the sealing gasket toward the front end of the central thermocouple. It prefabricates a cavity for the deformation of the sealing gasket, and guides the shape of the fixing bolt assembly and the bolt mounting hole so that the sealing gasket is deformed into a corner shape during the extrusion process, which makes the sealing surface a sealing structure of two vertical surfaces plus an angle, which can avoid the sealing gasket being directly squeezed to the front end position of the thermocouple, making it impossible for the thermocouple to contact the copper plate and cause water seepage problems, effectively improving the accuracy of the thermocouple detection results and ensuring the reliable execution of the steel leakage prediction system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, 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 drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of a sealing structure for a crystallizer copper plate thermocouple;

[0018] Figure 2 A schematic diagram of the front end structure of the fixing bolt provided by the present invention;

[0019] Figure 3 A schematic diagram of the sealing gasket structure provided by the present invention;

[0020] Figure 4 A schematic diagram of the bottom plane area structure provided by the present invention;

[0021] Figure 5 A schematic diagram of the structure of the water stop hole provided by the present invention;

[0022] Figure 6 A schematic diagram of the cavity structure provided by the present invention;

[0023] Figure 7 The present invention provides another structural schematic diagram of the sealing gasket.

[0024] In the figure: 1. crystallizer copper plate; 2. back plate; 3. fixing bolt body; 4. sealing gasket; 41. inner hole; 5. first thermocouple mounting hole; 6. truncated cone protrusion; 7. inclined surface; 8. columnar connecting part; 9. bolt mounting hole; 10. bottom plane area; 11. upper threaded area; 12. lower columnar area; 13. cavity; 14. water stop hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0026] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0027] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0028] See also Figure 1-7 As shown, a sealing structure for a crystallizer copper plate thermocouple in an embodiment of the present invention comprises a crystallizer copper plate 1, a back plate 2, a fixing bolt assembly and a sealing gasket 4. The crystallizer copper plate 1 and the back plate 2 are connected by a fixing bolt assembly, the sealing gasket 4 is abutted against the bottom of the fixing bolt assembly, a bolt mounting hole 9 is provided inside the crystallizer copper plate 1, the sealing gasket 4 is provided in the bolt mounting hole 9, the bolt mounting hole 9 and the fixing bolt assembly form a cavity 13, and the fixing bolt assembly squeezes the sealing gasket 4 and fills the cavity 13;

[0029] In the present invention, the crystallizer copper plate 1 and the back plate 2 are connected by a fixing bolt assembly, and a sealing gasket 4 is abutted at the bottom of the fixing bolt assembly. The fixing bolt assembly squeezes the sealing gasket 4 and fills the cavity 13, which can avoid deformation of the sealing gasket 4 toward the front end of the central thermocouple, and prefabricated the cavity 13 for the deformation of the sealing gasket 4. It guides the shape of the fixing bolt assembly and the bolt mounting hole 9 so that the sealing gasket 4 is deformed into a shape with a corner during the extrusion process, and the sealing surface becomes a sealing structure of two vertical surfaces plus an angle. The cooperation between the fixing bolt assembly and the bolt mounting hole 9 can effectively guide the deformation of the sealing gasket 4, so that it forms a specific shape with a corner according to the design when it is extruded, thereby overcoming the water seepage problem existing in the aforementioned sealing method, effectively improving the accuracy of the thermocouple detection results, and ensuring the reliable execution of the steel leakage prediction system.

[0030] In one embodiment, see Figure 1 and Figure 2 As shown, the fixing bolt assembly includes a fixing bolt body 3, which is arranged between the crystallizer copper plate 1 and the back plate 2, and a columnar connecting portion 8 is arranged at the bottom of the fixing bolt body 3, and inclined surfaces 7 are arranged on both sides of the columnar connecting portion 8, and the columnar connecting portion 8 is connected to a truncated cone protrusion 6 through the inclined surface 7, and the inclined surface 7 between the columnar connecting portion 8 and the truncated cone protrusion 6 guides the sealing gasket 4 to deform along a specific direction when subjected to force, and the sealing gasket 4 protrudes in the circumferential direction during the extrusion process, which can better fit the inner wall of the bolt mounting hole 9, further enhancing the sealing effect, and the truncated cone protrusion 6 forms a stable supporting structure at the bottom of the fixing bolt body 3, which can evenly disperse the pressure when subjected to force, and prevent the sealing gasket 4 from being torn or the performance from being degraded due to local uneven force;

[0031] The inclined surface 7 is designed to be at an angle of 5° to 20° with the horizontal plane, so that the sealing gasket 4 deforms outward in the circumferential direction when squeezed, rather than bulging toward the center (where the thermocouple is located). This structure avoids the sealing gasket 4 bulging toward the center and causing pressure or interference to the thermocouple, thereby protecting the normal working state of the thermocouple.

[0032] In one embodiment, see Figure 1 and Figure 2 As shown, a first thermocouple mounting hole 5 is provided inside the fixing bolt body 3. The first thermocouple mounting hole 5 provides a special position for accommodating the thermocouple so that it can be firmly embedded in the fixing bolt body 3. By integrating the thermocouple with the fixing bolt body 3, additional mounting components are reduced, and mechanical protection is provided for the thermocouple to prevent it from being damaged during operation or maintenance.

[0033] In one embodiment, see Figure 1 and Figure 4As shown, the bolt mounting hole 9 includes a bottom plane area 10, an upper threaded area 11 and a lower columnar area 12, the upper threaded area 11 is arranged on the crystallizer copper plate 1, the lower columnar area 12 is arranged below the upper threaded area 11, and the bottom plane area 10 is arranged below the lower columnar area 12;

[0034] The upper threaded area 11 is used for the installation of the fixing bolt assembly. Through the threaded connection method, it is ensured that the fixing bolt can be stably installed and withstand mechanical loads and environmental pressure;

[0035] The lower columnar area 12 provides guidance and support for the fixing bolt assembly, while leaving space for the deformation of the sealing gasket 4 to optimize the sealing performance;

[0036] The bottom plane area 10 serves as the bottom area of ​​the mounting hole, and provides the final plane constraint for the deformation and support of the sealing gasket 4, thereby ensuring that the sealing gasket 4 is evenly stressed and has a stable seal.

[0037] In one embodiment, see Figure 1 , Figure 2 and Figure 4 As shown, the outer diameter of the lower columnar region 12 is larger than the outer outer diameter of the columnar connecting portion 8 . The larger outer diameter of the lower columnar region 12 forms a transition limiting area. When the fixing bolt assembly squeezes the sealing gasket 4 , the deformation of the sealing gasket 4 will be limited by the outer diameter of the lower columnar region 12 .

[0038] In one embodiment, see Figure 1 , Figure 3 and Figure 7 As shown, in order to ensure that the compression amount of the sealing gasket 4 by the fixing bolt is fixed and accurate, the front end of the fixing bolt body 3 has a conical protrusion 6, the height of the sealing gasket 4 is S, the thickness of the conical protrusion 6 is H, and the thickness H of the conical protrusion 6 is 40% to 70% of the height S of the sealing gasket 4.

[0039] In one embodiment, see Figure 1 , Figure 3 and Figure 7 As shown, an inner hole 41 is provided inside the sealing gasket 4, and the outer diameter of the inner hole 41 is larger than the outer diameter of the truncated cone protrusion 6; the outer diameter of the inner hole 41 is larger than the outer diameter of the truncated cone protrusion 6, and a certain installation gap is reserved to facilitate the sealing gasket 4 to be quickly and accurately positioned during the assembly of the bolt assembly, thereby avoiding installation difficulties or damage to the sealing gasket 4 caused by over-tightening. Through the gap design, the initial stress of the sealing gasket 4 under compressive deformation during the installation process is reduced, so that the sealing gasket 4 can effectively fill the cavity 13 when it is compressed and deformed, and will not cause sealing failure due to being too high or too thin.

[0040] In one embodiment, see Figure 1 , Figure 3 and Figure 7As shown, the sealing gasket 4 is a sealing gasket made of rubber material. The rubber material is selected according to specific needs, and different rubbers (such as silicone rubber, fluororubber, etc.) with oil resistance, water resistance, chemical corrosion resistance and other properties are selected to adapt to the cooling medium or other chemical environment that may exist in the crystallizer.

[0041] The inner diameter D1 of the lower columnar area 12 is larger than the outer diameter D2 of the columnar connecting portion 8 on the side of the fixing bolt body 3. They jointly constitute a cavity 13 that can accommodate the sealing gasket 4 to be squeezed and deformed. The outer diameter D3 of the sealing gasket 4 is the same as D1. Under the extrusion of the fixing bolt body 3, the sealing gasket 4 is squeezed and deformed, and fills the cavity 13 to form a sealing structure with a corner, which can effectively prevent the occurrence of water seepage in the thermocouple hole.

[0042] The thickness of the sealing gasket 4 in the present invention is 2-6 mm; its material can be rubber, silicone, fluororubber, graphite pad, asbestos rubber pad, etc., or other soft composite materials that are easily compressed and deformed.

[0043] The sealing gasket 4 is a structure with a hole in the middle. In order to prevent the sealing gasket 4 from deforming toward the front end of the thermocouple during the extrusion process, the diameter D4 of the inner hole 41 of the sealing gasket 4 is made to be 1 to 2.5 mm larger than the outer diameter D5 of the conical boss 6 protruding from the front end of the fixing bolt body 3. This is to ensure that the sealing gasket 4 squeezed into the cavity 13 has a certain thickness, that is, it has a better sealing effect. When the thickness of the sealing gasket 4 squeezed into the cavity 13 is too small, the sealing effect will be greatly lost.

[0044] In order to ensure the corner sealing effect of the front end of the fixing bolt body 3 compressing the sealing gasket 4, the inner hole 41 of the sealing gasket 4 is cylindrical. Figure 3 or the inner hole 41 of the sealing gasket 4 is a conical and cylindrical combination to form an inner hole 41, forming a thick outer and thin inner shape characteristics, see Figure 7 As shown, the corner sealing effect of the sealing gasket 4 is improved.

[0045] The present invention makes the contact surface of the fixing bolt body 3 compressing the sealing gasket 4 into an inclined surface 7, and the inclined height difference h of the inclined surface is 0.5-1.5 mm. This is to further guide the deformation of the sealing gasket 4 and force the sealing gasket 4 to deform in the outer diameter direction and the prefabricated cavity 13.

[0046] The fixing bolt body 3 compresses the inclined surface 7 of the sealing gasket 4. The angle between the inclined surface 7 and the horizontal plane is 5°~20°. The purpose is to make the extruded sealing gasket 4 bulge outward from the circumference. If the thickness of the sealing gasket 4 is too thin, it cannot produce sufficient deformation to the side during the extrusion process; if the sealing gasket 4 is too thick, the deformation to the side during the extrusion process is sufficient, but the depth of the bolt mounting hole 9 on the crystallizer copper plate 1 is limited, and the thickness of the sealing gasket 4 should not be too large. Therefore, a reasonable thickness of the sealing gasket 4 should be maintained.

[0047] In the present invention, a smooth columnar connecting portion 8 is provided on the outer diameter of the fixing bolt body 3 , and the height h1 of the smooth columnar connecting portion 8 is 2 to 5 mm.

[0048] The height h2 of the lower columnar area 12 of the side of the lower part of the bolt installation hole 9 on the crystallizer copper plate 1 is H+h+h1; the inner diameter D1 of the lower columnar area 12 of the side of the lower part of the bolt installation hole 9 on the copper plate 1 is 1.5-3.5 mm larger than the outer diameter D2 of the columnar connecting portion 8 on the side of the fixing bolt body 3. The lower columnar area 12 of the lower part of the bolt installation hole 9 on the copper plate 1 and the smooth columnar connecting portion 8 on the outer diameter of the fixing bolt body 3 jointly form the cavity 13 required for the deformation of the sealing gasket 4. The bottom plane area 10 of the bolt installation hole 9 is designed as a plane, and the side of the lower columnar area 12 is designed as an arc surface. The purpose is to create a sealing structure composed of a bottom plane plus a corner and a side arc plane area for the squeezed and deformed sealing gasket 4.

[0049] In the present invention, the bottom of the bolt mounting hole 9 is a bottom plane area 10. Figure 4 A water stop hole 14 is provided at the center of the bottom plane area 10, the water stop hole 14 is used to prevent the water mist generated by the thermocouple from leaking, see Figure 5 The design of the water stop hole 14 forms a secondary sealing barrier. Even if the main seal (seal 4) leaks for some reason, the water stop hole 14 can prevent the liquid from further spreading or leaking out. Through the graded sealing structure, the water stop hole 14 effectively enhances the anti-seepage performance of the entire system, ensuring that the coolant or other media does not penetrate into the external environment, and improving the operating safety of the crystallizer.

[0050] The structure is suitable for occasions where a continuous casting crystallizer uses a thermocouple to detect the temperature of a copper plate, and can be applied to a large slab crystallizer, a thin slab crystallizer, a large square billet crystallizer, a large round billet crystallizer and a special-shaped billet crystallizer.

[0051] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A sealing structure for a crystallizer copper plate thermocouple, comprising a crystallizer copper plate, a back plate, a fixing bolt assembly and a sealing gasket, characterized in that: The crystallizer copper plate and the back plate are connected by a fixing bolt assembly, a sealing gasket is abutted against the bottom of the fixing bolt assembly, a bolt mounting hole is provided inside the crystallizer copper plate, the sealing gasket is provided in the bolt mounting hole, a cavity is formed between the bolt mounting hole and the fixing bolt assembly, and the fixing bolt assembly squeezes the sealing gasket and fills the cavity.

2. A sealing structure for a crystallizer copper plate thermocouple according to claim 1, characterized in that: The fixing bolt assembly includes a fixing bolt body, which is arranged between the crystallizer copper plate and the back plate. A columnar connecting part is arranged at the bottom of the fixing bolt body. Inclined surfaces are arranged around the columnar connecting part, and the columnar connecting part is connected to a truncated cone protrusion through the inclined surface.

3. A sealing structure for a crystallizer copper plate thermocouple according to claim 2, characterized in that: A first thermocouple mounting hole is arranged inside the fixing bolt body.

4. A sealing structure for a crystallizer copper plate thermocouple according to claim 2, characterized in that: The bolt mounting hole comprises a bottom plane area, an upper threaded area and a lower columnar area, wherein the upper threaded area is arranged on the copper plate of the crystallizer, the lower columnar area is arranged below the upper threaded area, and the bottom plane area is arranged below the lower columnar area.

5. A sealing structure for a crystallizer copper plate thermocouple according to claim 4, characterized in that: The outer diameter of the lower columnar region is greater than the outer outer diameter of the columnar connecting portion.

6. A sealing structure for a crystallizer copper plate thermocouple according to claim 2, characterized in that: An inner hole is arranged inside the sealing gasket, and the outer diameter of the inner hole is larger than the outer diameter of the truncated cone protrusion.

7. A sealing structure for a crystallizer copper plate thermocouple according to claim 6, characterized in that: The height of the sealing gasket is S, the thickness of the truncated cone protrusion is H, and the thickness H of the truncated cone protrusion is 40% to 70% of the height S of the sealing gasket.

8. The sealing structure for a crystallizer copper plate thermocouple according to claim 5, characterized in that: The sealing gasket is made of rubber material.

9. The sealing structure for a crystallizer copper plate thermocouple according to claim 4, characterized in that: A water stop hole is also arranged below the bottom plane area.

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