A soaking pit for billet heat treatment

Abstract

The utility model relates to the technical field of heating furnace, specifically relates to a soaking pit for billet heat treatment, the utility model provides a soaking pit for billet heat treatment, the soaking pit includes a plurality of side wall body, at least has one side wall body and is equipped with the thermocouple mounting hole for installing thermocouple, the side wall body has opposite outer wall and inner wall, the thermocouple mounting hole includes the first hole body and the second hole body of intercommunication, the second hole body with the first hole body is arranged along the direction of the inner wall of side wall body to its outer wall, the first hole body is round hole. There is enough space between the inner wall of second hole body and thermocouple measuring end to exchange heat between thermocouple measuring end and surrounding environment, so it can ensure that thermocouple can respond to the temperature change in the soaking pit quickly, since the measuring end of thermocouple is located in the second hole body entirely, so the situation that billet breaks thermocouple does not appear.

Description

Technical Field

[0001] This utility model relates to the field of heating furnace and kiln technology, and specifically to a soaking pit for heat treatment of steel billets. Background Technology

[0002] A soaking pit is a special type of heating furnace. This furnace has a central burner at the bottom, and each soaking pit has a circular thermocouple mounting hole on its side wall. The diameter of the thermocouple mounting hole is approximately 50 mm, and a precious metal thermocouple is installed inside. This thermocouple is used to measure the temperature inside the soaking pit and monitor the temperature change trend. During the heating, holding, and cooling stages of the soaking pit, the thermocouple is required to provide timely feedback on dynamic temperature changes. Thermocouples sense temperature changes by transferring heat between their measuring ends and the surrounding environment. Under normal circumstances, the thermocouple can respond quickly to temperature changes within the soaking pit.

[0003] Currently, when installing thermocouples, the thermocouple measuring end cannot be located inside the thermocouple mounting hole. Instead, the thermocouple measuring end needs to extend about 100mm-200mm out of the thermocouple mounting hole. This is because the diameter of the thermocouple mounting hole is small, and the space between the thermocouple measuring end and the inner wall of the thermocouple mounting hole is small. This will hinder the heat exchange of the actual environment in the heat exchange pit of the thermocouple measuring end, and the thermocouple cannot respond quickly to the temperature changes in the heat exchange pit.

[0004] However, during the hoisting of steel billets, the billets are clamped in and out of the pit by clamps, and the thermocouple heads protruding from the furnace wall are often broken, resulting in economic losses. Utility Model Content

[0005] (I) The problem to be solved by this utility model is that during the process of hoisting steel billets, the steel billets are clamped in and out of the pit by clamps, and the thermocouple head extending out of the furnace wall is often broken, resulting in economic losses.

[0006] (II) Technical Solution

[0007] A heat soaking pit for heat treatment of steel billets, the heat soaking pit includes a plurality of side walls, at least one side wall is provided with a thermocouple mounting hole for installing a thermocouple, and the side wall has opposing outer walls and inner walls;

[0008] The thermocouple mounting hole includes a first hole body and a second hole body that are connected to each other. The second hole body and the first hole body are arranged along the direction from the inner wall of the side wall to its outer wall.

[0009] The first hole is a circular hole, and the projection of the first hole in its axial direction falls into the second hole. The second hole forms an opening on the inner wall of the side wall. The ratio of the projected area of ​​the first hole along its axial direction to the projected area of ​​the opening along the axial direction of the first hole is 2:15 to 2:11.

[0010] The temperature measuring end of the thermocouple passes through the first aperture and extends into the second aperture.

[0011] According to one embodiment of the present invention, the second hole body is frustum-shaped, and the diameter of the horn hole gradually decreases along the direction from the inner wall to the outer wall of the side wall.

[0012] According to one embodiment of the present invention, the second hole has a large-diameter end and a small-diameter end, the diameter of the small-diameter end of the second hole is the same as the inner diameter of the first hole; the ratio of the diameter of the large-diameter end to the diameter of the small-diameter end of the second hole is 11:2 to 15:2.

[0013] According to one embodiment of the present invention, the second hole is a square hole, and the cross-section of the second hole remains unchanged along the direction from the inner wall to the outer wall of the side wall.

[0014] According to one embodiment of the present invention, the diameter of the horn hole remains constant and then gradually decreases along the direction from the inner wall to the outer wall of the side wall.

[0015] According to one embodiment of the present invention, a sleeve for protecting the temperature measuring end of the thermocouple is installed in the thermocouple mounting hole;

[0016] The sleeve includes a straight tube and a conical tube connected in sequence, and the conical tube has a plurality of through holes evenly provided.

[0017] Along the direction from the inner wall to the outer wall of the side wall, the straight pipe passes through the second hole and enters the first hole, while the conical pipe is located in the second hole.

[0018] The beneficial effects of this utility model are:

[0019] Sufficient space is left between the thermocouple measuring end and the inner wall of the second cavity to allow the thermocouple measuring end to exchange heat with the surrounding environment. The measurement accuracy of the thermocouple depends on its normal heat exchange with the surrounding environment. Therefore, it can ensure that the thermocouple can respond quickly to temperature changes in the soaking pit. Moreover, since the thermocouple measuring end is entirely located in the second cavity, the steel billet will not break the thermocouple, thus avoiding the problem of the thermocouple measuring end being frequently broken by the steel billet and avoiding economic losses. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the first type of side wall and thermocouple according to the present invention;

[0022] Figure 2 A schematic diagram of the first type of sidewall provided in this embodiment of the utility model;

[0023] Figure 3 A first dimension drawing of a first type of thermocouple mounting hole provided for an embodiment of this utility model;

[0024] Figure 4 A second dimension drawing of the first type of thermocouple mounting hole provided in this embodiment of the utility model;

[0025] Figure 5 A structural diagram of the second type of sidewall provided in this embodiment of the utility model;

[0026] Figure 6 A structural diagram of a third type of sidewall provided in this embodiment of the utility model;

[0027] Figure 7 A schematic diagram of the first type of sidewall, thermocouple, and sleeve provided for an embodiment of this utility model;

[0028] Figure 8 This is a structural diagram of the sleeve provided in an embodiment of the present utility model.

[0029] Icons: 1. Side wall; 2. Thermocouple mounting hole; 201. First hole; 202. Second hole; 3. Thermocouple; 4. Sleeve; 401. Straight pipe; 402. Conical pipe; 403. Ring plate; 404. Screw; 405. Through hole. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] like Figures 1-8As shown, one embodiment of the present invention provides a heat soaking pit for heat treatment of steel billets. The heat soaking pit includes multiple side walls 1, at least one side wall 1 is provided with a thermocouple mounting hole 2 for installing a thermocouple 3, and the side wall 1 has an outer wall and an inner wall.

[0032] The thermocouple mounting hole 2 includes a first hole body 201 and a second hole body 202 that are connected to each other. The second hole body 202 and the first hole body 201 are arranged along the direction from the inner wall of the side wall 1 to its outer wall.

[0033] The first hole 201 is a circular hole. The projection of the first hole 201 along its axial direction falls into the second hole 202. The second hole 202 has an opening on the inner wall of the side wall 1. The ratio of the projected area of ​​the first hole 201 along its axial direction to the projected area of ​​the opening along the axial direction of the first hole 201 is 2:15 to 2:11.

[0034] The temperature measuring end of thermocouple 3 passes through the first orifice 201 and extends into the second orifice 202.

[0035] It should be noted that the reason why thermocouple 3 needed to extend beyond the thermocouple mounting hole 2 in the past was that the mounting hole was a round hole with a small diameter. If thermocouple 3 were entirely located inside the mounting hole on the wall, the limited space between thermocouple 3 and the inner wall of the mounting hole would prevent thermocouple 3 from fully exchanging heat with the furnace environment, thus restricting heat exchange between thermocouple 3 and the surrounding environment. Therefore, the measuring end of thermocouple 3 had to extend out of the mounting hole.

[0036] In this embodiment, the thermocouple mounting hole 2 is improved. Unlike the previous circular hole, the thermocouple mounting hole 2 includes a first hole body 201 and a second hole body 202 that are connected. The second hole body 202 and the first hole body 201 are arranged along the direction from the inner wall of the side wall 1 to its outer wall. That is, the first hole body 201 is closer to the outer wall of the side wall 1, and the second hole body 202 is closer to the inner wall of the side wall 1. The first hole body 201 is a circular hole, and the projection of the first hole body 201 in its axial direction falls into the second hole body 202. The ratio of the projected area of ​​the first hole body 201 in its axial direction to the projected area of ​​the opening in the axial direction of the first hole body 201 is 2:15 to 2:11, that is, the size of the second hole body 202 is much larger than the size of the first hole body 201.

[0037] Thus, when installing thermocouple 3, if Figure 1As shown, the measuring end of thermocouple 3 passes through the first hole 201 from the outer wall of the side wall 1 and enters the second hole 202. Note that the measuring end of thermocouple 3 does not protrude from the side wall 1 at this time. Due to the large volume of the second hole 202 and the large size of the opening of the second hole 202 on the inner wall of the side wall 1, there is sufficient space between the measuring end of thermocouple 3 and the inner wall of the second hole 202 to allow the measuring end of thermocouple 3 to exchange heat with the surrounding environment. The measurement accuracy of thermocouple 3 depends on its normal heat exchange with the surrounding environment, thus ensuring that thermocouple 3 can respond quickly to temperature changes in the heat exchange pit. Moreover, since the measuring end of thermocouple 3 is entirely located inside the second hole 202, the steel billet will not break the thermocouple 3, avoiding the problem of the measuring end of thermocouple 3 being frequently broken by the steel billet and avoiding economic losses.

[0038] In some embodiments, such as Figures 1-4 As shown, the second hole 202 is frustum-shaped. Along the direction from the inner wall of the side wall 1 to its outer wall, the diameter of the second hole 202 gradually decreases. The second hole 202 has a relatively large diameter end and a small diameter end. The small diameter end of the second hole 202 is connected to the first hole 201, and the diameter of the small diameter end of the second hole 202 is the same as the diameter of the first hole 201.

[0039] As a specific embodiment, such as Figure 3 and Figure 4 As shown, the diameter of the first hole 201 is 50mm, and the diameter of the larger diameter end of the second hole 202 is 325mm, meaning the ratio of the diameter of the larger diameter end to the diameter of the smaller diameter end of the second hole 202 is 13:2. It should be noted that this embodiment does not impose a specific limitation on the ratio of the diameter of the larger diameter end to the diameter of the smaller diameter end of the second hole 202; the ratio can be reasonably set according to actual conditions.

[0040] Thus, when thermocouple 3 is installed into thermocouple mounting hole 2, as... Figure 3 As shown, at this time, the measuring end of thermocouple 3 is located inside the second hole 202. The measuring end of thermocouple 3 does not protrude from the inner wall of the side wall 1. Moreover, at this time, the space between the measuring end of thermocouple 3 and the inner wall of the second hole 202 is large enough to allow thermocouple 3 to exchange heat fully with the surrounding environment, while thermocouple 3 will not be broken by the steel billet.

[0041] In some embodiments, the thermocouple mounting hole 2 is as follows: Figure 5 As shown, the first hole 201 in the thermocouple mounting hole 2 is a circular hole, and the second hole 202 is a rectangular or square hole, that is, the projection of the second hole 202 along the axial direction of the first hole 201 is rectangular. The ratio of the projected area of ​​the second hole 202 along the axial direction of the first hole 201 to the area of ​​the cross-section of the second hole 202 is 11:2 to 15:2, preferably 13:2.

[0042] In some embodiments, the thermocouple mounting hole 2 is as follows: Figure 6 As shown, the first hole 201 in the thermocouple mounting hole 2 is a circular hole, and the second hole 202 is funnel-shaped, which can be regarded as consisting of two parts: the first part is cylindrical and the second part is frustum-shaped. That is, along the direction from the inner wall of the side wall 1 to its outer wall, the diameter of the second hole 202 remains constant and then gradually decreases.

[0043] It should be emphasized that this application does not impose too many restrictions on the shape of the second hole 202, as long as the space enclosed between the inner wall of the second hole 202 and the thermocouple 3 is large enough.

[0044] Optionally, to prevent the thermocouple 3 from accidentally moving horizontally during hoisting, such as... Figure 7 and Figure 8 As shown, a sleeve 4 for protecting the temperature measuring end of the thermocouple 3 is installed inside the thermocouple mounting hole 2; the sleeve 4 includes a straight tube 401 and a conical tube 402 connected in sequence, and a plurality of through holes 405 are evenly opened on the conical tube 402. The end of the straight tube 401 away from the conical tube 402 is provided with an external thread, and an annular plate 403 is threadedly connected to the external thread area, and a screw hole is opened on the annular plate 403 around its axis.

[0045] like Figure 7 As shown, when installing the sleeve 4, it is inserted into the thermocouple mounting hole 2 from inside the heat exchange pit. The straight tube 401 of the sleeve 4 passes through the second hole 202 and the first hole 201 in sequence, while the conical tube 402 is located inside the second hole 202 and does not protrude from the side wall 1. Then, the ring plate 403 is threaded onto the straight tube 401 from outside the heat exchange pit, and finally, the ring plate 403 is fixed to the side wall 1 using screws 404.

[0046] In this way, the measuring end of thermocouple 3 is inserted from the outer wall of side wall 1 into the first hole 201 of thermocouple mounting hole 2, and the measuring end of thermocouple 3 extends into sleeve 4 until the measuring end of thermocouple 3 is located inside the conical tube 402 of sleeve 4. Since there are many through holes 405 evenly provided on the circumference of conical tube 402, it can ensure that thermocouple 3 can fully exchange with the surrounding environment. And the measuring end of thermocouple 3 is covered by the conical tube 402 of sleeve 4, which can also protect the measuring end of thermocouple 3. When the billet moves laterally, it will hit the end of the conical tube 402 of sleeve 4, but will not directly hit the measuring end of thermocouple 3, thus effectively protecting thermocouple 3.

[0047] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A soaking pit for heat treatment of steel billets, characterized in that, The heat exchange pit includes multiple side walls (1), at least one side wall (1) is provided with a thermocouple mounting hole (2) for installing a thermocouple (3), and the side wall (1) has an outer wall and an inner wall opposite to each other; The thermocouple mounting hole (2) includes a first hole body (201) and a second hole body (202) that are connected to each other. The second hole body (202) and the first hole body (201) are arranged along the direction from the inner wall to the outer wall of the side wall (1). The first hole (201) is a circular hole. The projection of the first hole (201) along its axial direction falls into the second hole (202). The second hole (202) has an opening on the inner wall of the side wall (1). The ratio of the projected area of ​​the first hole (201) along its axial direction to the projected area of ​​the opening along the axial direction of the first hole (201) is 2:15 to 2:

11. The temperature measuring end of the thermocouple (3) passes through the first orifice (201) and extends into the second orifice (202).

2. The soaking pit for heat treatment of steel billets according to claim 1, characterized in that, The second hole (202) is frustum shaped, and the diameter of the second hole (202) gradually decreases along the direction from the inner wall to the outer wall of the side wall (1).

3. The soaking pit for heat treatment of steel billets according to claim 2, characterized in that, The second hole (202) has a large diameter end and a small diameter end. The diameter of the small diameter end of the second hole (202) is the same as the inner diameter of the first hole (201). The ratio of the diameter of the large diameter end to the diameter of the small diameter end of the second hole (202) is 11:2 to 15:

2.

4. The soaking pit for heat treatment of steel billets according to claim 1, characterized in that, The second hole (202) is a square hole, and the cross-section of the second hole (202) remains unchanged along the direction from the inner wall to the outer wall of the side wall (1).

5. A soaking pit for heat treatment of steel billets according to claim 1, characterized in that, In the direction from the inner wall to the outer wall of the side wall (1), the diameter of the second hole (202) remains constant at first and then gradually decreases.

6. A soaking pit for heat treatment of steel billets according to claim 2, characterized in that, The thermocouple mounting hole (2) is equipped with a sleeve (4) for protecting the temperature measuring end of the thermocouple (3); the sleeve (4) includes a straight tube (401) and a conical tube (402) connected in sequence, and a plurality of through holes (405) are evenly opened on the conical tube (402); along the direction from the inner wall to the outer wall of the side wall (1), the straight tube (401) passes through the second hole (202) and enters the first hole (201), and the conical tube (402) is located in the second hole (202).

7. A soaking pit for heat treatment of steel billets according to claim 6, characterized in that, The straight pipe (401) is provided with a ring plate (403) at one end away from the conical pipe (402), and the ring plate (403) is fixed to the side wall (1) by screws (404).

8. A soaking pit for heat treatment of steel billets according to claim 7, characterized in that, The straight tube (401) has an external thread at the end away from the conical tube (402), and the inner wall of the ring plate (403) has a screw hole that matches the external thread.

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