Split heat-resistant pad for heating furnace

Abstract

The utility model discloses a split type heat -resistant cushion block for heating furnace belongs to heating furnace technical field, and this cushion block includes upper cushion block, base and briquetting, is equipped with the accommodating groove on the base, and the height of upper cushion block is greater than the depth of accommodating groove, and the base includes first seat body and second seat body, and first seat body is detachably connected with second seat body through first bolt, is equipped with first recess on first seat body, is equipped with second recess on second seat body, when first seat body is connected with second seat body, first recess and second recess combination form accommodating groove. The utility model base split type design, the convenient installation maintenance can alleviate the material use amount of upper cushion block, only need to replace upper cushion block when furnace maintenance, upper cushion block adopts the taper design of small upper big lower, can better disperse the steel billet weight to the base, and the structure is stable, is favorable to reduce the steel billet black print, when upper cushion block is located in accommodating groove, will not shift up and down or left and right, and upper cushion block also can not be extracted, greatly improved the stability of cushion block.

Description

Technical Field

[0001] This utility model belongs to the field of heating furnace technology, specifically relating to a split-type heat-resistant pad for heating furnaces. Background Technology

[0002] Heat-resistant pads for heating furnaces are support components specifically designed for high-temperature industrial environments. They are typically installed on the water beam pipes of the heating furnace, serving as support nodes for the water beams and walking beams. They bear the weight of the steel billet, prevent direct contact between the billet and the water beam pipe, and function to support the workpiece and protect the water beam pipe. They also help reduce the temperature difference caused by blackening of the steel billet. The installation method for heat-resistant pads in the high-temperature section on the water beam pipe is generally a saddle-type, where the heat-resistant pad is placed on the water-cooled beam, and then the pin portion of the pad is fixed by a clamping block, which is then welded to the water beam pipe. Existing high-temperature section heat-resistant pads are generally made of cobalt-based or nickel-based high-temperature alloys, integrally cast, and their maximum operating temperature is 1280℃.

[0003] In order to further reduce black marks on steel billets and improve the heating quality of steel billets, the furnace temperature of medium and heavy plate heating furnaces has been increased to 1350℃ or even higher in recent years. At this time, heat-resistant pads made of chromium-based alloys or composite materials are required. These heat-resistant pads are difficult to form using traditional casting methods and are not suitable for complex structures. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a split-type heat-resistant pad for heating furnaces. The split-type structure is suitable for heating furnaces with higher furnace temperatures.

[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A split-type heat-resistant pad for a heating furnace includes an upper pad, a base for accommodating the upper pad, and a pressing block for pressing the base onto a water beam pipe. The base has a receiving groove, and the height of the upper pad is greater than the depth of the receiving groove. The base includes a first seat body and a second seat body symmetrically arranged with respect to the first seat body. The first seat body is detachably connected to the second seat body by a first bolt. The first seat body has a first groove, and the second seat body has a second groove. When the first seat body and the second seat body are connected, the first groove and the second groove combine to form the receiving groove.

[0007] Furthermore, the upper pad is frustum-shaped, and the corners of the lower end face of the upper pad are all rounded.

[0008] Furthermore, the upper end face of the upper pad is rectangular.

[0009] Furthermore, there are two or more of the first bolts.

[0010] Furthermore, when the temperature is between 200°C and 1350°C, there is a gap between the upper pad and the base.

[0011] Furthermore, both sides of the first and second seats are provided with connecting ears, and the connecting ears are provided with first through holes, through which the first bolt passes.

[0012] Furthermore, the base is provided with a curved groove corresponding to the water beam pipe.

[0013] Furthermore, the base is made of ZG40Cr25Ni20 heat-resistant cast steel.

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

[0015] 1. The base is designed in a split manner, including a first base body and a second base body. The first base body and the second base body are connected by bolts, which facilitates installation and maintenance and can reduce the amount of material used for the upper pad. The base part is protected by the cooling water of the water beam and the refractory material wrapped around it, making it less prone to damage. Only the upper pad needs to be replaced when the furnace is shut down for maintenance.

[0016] 2. The upper pad adopts a conical design with a smaller upper surface and a larger lower surface, which can better distribute the weight of the steel billet to the base, making the structure stable. At the same time, the smaller upper surface reduces the contact area between the heat-resistant pad and the steel billet, which helps to reduce the "black marks" on the steel billet. The receiving groove of the base is also smaller at the top and larger at the bottom, matching the upper pad. When the upper pad is located in the receiving groove, it will not shift up and down or left and right, and the upper pad cannot be pulled out, which greatly improves the stability of the pad.

[0017] 3. The upper pad and the base are designed separately. The base is made of heat-resistant cast steel, while the upper pad can be made of a different material. The thermal expansion coefficient of the base is greater than that of the upper pad. At high temperatures, there is a gap between the upper pad and the base, so the base will not exert lateral force on the pad, allowing the pad to bear only unidirectional pressure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the heat-resistant pad structure according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the upper pad block structure in the embodiment;

[0020] Figure 3 This is a schematic diagram of the base structure in the embodiment;

[0021] Figure 4 This is a schematic diagram of the pressure block structure in the embodiment;

[0022] Figure 5 This is a schematic diagram of the side structure of the heat-resistant pad in the embodiment. Detailed Implementation

[0023] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0024] like Figure 1 As shown, a split-type heat-resistant pad for a heating furnace includes an upper pad 1, a base 2, and a pressure block 3. The upper pad 1 is frustoconical in shape, with a rectangular upper and lower surface. The cross-sectional area of ​​the upper pad 1 gradually increases from top to bottom. All four corners of the lower surface of the upper pad 1 are chamfered to form rounded corners, and the four sides of the lower surface are also chamfered to form rounded edges. The four sides of the upper surface can also be chamfered to form rounded edges. In this embodiment, the upper pad 1 is made of existing metal composite materials, such as chromium-based high-temperature alloys. The rounded corners of the upper pad 1 reduce stress concentration, and the sides have a certain slope to facilitate mating with the base 2.

[0025] like Figure 1As shown, the upper end face of the base 2 is provided with a receiving groove 201 for receiving the upper pad 1. The shape of the receiving groove 201 corresponds to the shape of the upper pad 1. The cross-sectional area of ​​the receiving groove 201 gradually increases from top to bottom. The inner corner of the bottom of the receiving groove 201 is also rounded. The height of the upper pad 1 is greater than the depth of the receiving groove 201. When the upper pad 1 is located inside the receiving groove 201, the upper half of the upper pad 1 is located outside the receiving groove 201. The base 2 includes a first base body 21 and a second base body 22, which are symmetrically arranged, i.e., the base 2 is a split type. The first base body 21 and the second base body 22 are each half of the base 2. When the first base body 21 and the second base body 22 are closed, the base 2 is formed. Both sides of the first base body 21 and the second base body 22 are provided with connecting ears 23. Each connecting ear 23 is provided with two first through holes 231, which are arranged vertically. When the first base body 21 and the second base body 22 are closed, the two first through holes 231 on the connecting ears 23 of the first base body 21 open. The through hole 231 is aligned with the two first through holes 231 on the corresponding connecting ears 23 on the second seat 22. The first bolt 51 passes through the two aligned first through holes 231 and is connected to the first nut. The first seat 21 and the second seat 22 are detachably connected by four first bolts 51. A first groove 211 is provided on one side of the first seat 21, and a second groove 221 is provided on the opposite side of the second seat 22. When the first seat 21 and the second seat 22 are connected, the first groove 211 and the second groove 221 combine to form a receiving groove 201. Since the upper pad 1 is smaller at the top and larger at the bottom, it is more stable in use. Moreover, the receiving groove 201 is also smaller at the top and larger at the bottom. When the upper pad 1 is located in the receiving groove 201, it will not move up and down or left and right, and the upper pad 1 cannot be pulled out, which greatly improves the stability of the pad 1. If the upper pad 1 is damaged, replace the upper pad 1 separately (when replacing, use carbon arc gouging to remove the pressure block weld and bolt head, and replace both of them and the upper pad 1). The base 2 is made of ZG40Cr25Ni20 heat-resistant cast steel with good casting performance and a cost much lower than the material of the upper pad 1, which effectively reduces costs. In addition, the thermal expansion coefficient of ZG40Cr25Ni20 heat-resistant cast steel is greater than that of the metal composite material of the upper pad 1. After the upper pad 1 and the base 2 are heated (the base 2 is wrapped with refractory material, and there is vaporized cooling circulating water in the water pipe below, so the temperature is arranged in a gradient, the surface of the upper pad 1 is 1300~1350℃, and the bottom surface of the base 2 is only 200~300℃), there is a gap between the upper pad 1 and the base 2. Under the high temperature (200℃~1350℃) state, the base 2 will not generate lateral force on the upper pad 1, so that the upper pad 1 only bears unidirectional pressure.

[0026] like Figure 1As shown, the lower end face of the base 2 is provided with a curved groove 202, which corresponds to the curvature of the water beam pipe 4. When in use, the lower end face of the base 2 is attached to the water beam pipe 4. The outer side of the first seat body 21 is provided with a first step 212, and the outer side of the second seat body 22 is provided with a second step 222. The pressure block 3 is provided with a right angle groove 31 corresponding to the first step 212 or the second step 222. When in use, the pressure block 3 presses on the first seat body 21 or the second seat body 22 through the cooperation of the right angle groove 31 and the step. Multiple pressure blocks 3 together press the base 2 onto the water beam pipe 4. The pressure block 3 is made of the same ZG40Cr25Ni20 heat-resistant cast steel material as the base 2. Then, the pressure block 3 is welded to the water beam pipe 4 to complete the installation of the heat-resistant pad.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A split-type heat-resistant pad for a heating furnace, characterized in that, The device includes an upper pad (1), a base (2) for accommodating the upper pad (1), and a pressing block (3) for pressing the base (2) onto the water beam pipe (4). The base (2) is provided with a receiving groove (201). The height of the upper pad (1) is greater than the depth of the receiving groove (201). The base (2) includes a first seat body (21) and a second seat body (22) symmetrically arranged with the first seat body (21). The first seat body (21) is detachably connected to the second seat body (22) by a first bolt (51). The first seat body (21) is provided with a first groove (211), and the second seat body (22) is provided with a second groove (221). When the first seat body (21) and the second seat body (22) are connected, the first groove (211) and the second groove (221) combine to form the receiving groove (201).

2. The split-type heat-resistant pad for a heating furnace according to claim 1, characterized in that, The upper pad (1) is truncated cone-shaped, and the corners of the lower end face of the upper pad (1) are all rounded.

3. The split-type heat-resistant pad for a heating furnace according to claim 2, characterized in that, The upper surface of the upper pad (1) is rectangular.

4. The split-type heat-resistant pad for a heating furnace according to claim 2, characterized in that, There are two or more of the first bolts (51).

5. The split-type heat-resistant pad for a heating furnace according to claim 1, characterized in that, When the temperature is between 200°C and 1350°C, there is a gap between the upper pad (1) and the base (2).

6. The split-type heat-resistant pad for a heating furnace according to claim 1, characterized in that, Both sides of the first seat (21) and the second seat (22) are provided with connecting ears (23), and the connecting ears (23) are provided with a first through hole (231), and the first bolt (51) passes through the first through hole (231).

7. The split-type heat-resistant pad for a heating furnace according to claim 1, characterized in that, The base (2) is provided with a curved groove (202) corresponding to the water beam pipe (4).

8. The split-type heat-resistant pad for a heating furnace according to claim 1, characterized in that, The base (2) is made of ZG40Cr25Ni20 heat-resistant cast steel.

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