Novel sealing structure of material pipe and cap under calcium carbide furnace

Abstract

The utility model relates to the technical field of sealing of calcium carbide furnace blanking pipe, concretely to a new type calcium carbide furnace blanking pipe and cap sealing structure, including the cap of detachable connection in the one end of blanking pipe, the outer surface welding of blanking pipe has a plurality of nut, the inner wall of each nut all is connected with screw rod, and the one end of screw rod can move along the axial direction of blanking pipe, the outer surface of blanking pipe near the one end of nut is connected with plane flange, the upper surface of plane flange and the one end of screw rod abut, the outer surface of cap upper end is provided with round pipe hoop, the upper end of round pipe hoop is opened along the circumference and is provided with annular accommodating groove, the inner wall of accommodating groove is provided with asbestos packing. The new type calcium carbide furnace blanking pipe and cap sealing structure solve the problem of carbon monoxide leakage alarm on site, improve the dust overflow condition to guarantee production safety and improve the working environment, also significantly reduce the maintenance duration and personnel labor intensity, improve the maintenance efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology for the feed pipe of a calcium carbide furnace, specifically a novel sealing structure for the feed pipe and cap of a calcium carbide furnace. Background Technology

[0002] In traditional calcium carbide furnace production systems, the feed pipe and feed cap are key supporting components in the feeding process. They work together to ensure the continuous, safe, and stable production of calcium carbide. As the conveying channel for the main raw materials of the calcium carbide furnace, such as lime and coke, the feed pipe needs to stably and evenly transport the raw materials in the storage silo to the furnace chamber according to the production process requirements, ensuring that the raw material supply matches the reaction rhythm inside the furnace. The feed cap is installed at the connection between the feed pipe and the storage silo. Its core function is to seal the interface gap, prevent dust from overflowing during the raw material transportation process, and block external air and moisture from entering the feed pipe. The traditional connection between the feed pipe and the feed cap of a calcium carbide furnace adopts a combination of self-made clamps and high-alumina castable. The basic connection between the feed pipe and the feed cap is achieved by self-made clamps, and then high-alumina castable is poured at the connection between the clamps and the feed cap to form a sealing structure, thereby preventing media leakage and intrusion.

[0003] However, existing technologies have the following problems in practical use; Traditional sealing structures, after the calcium carbide furnace is put into operation under increased load, will directly cause the high-alumina castable to solidify and shrink due to the evaporation of moisture in the material column. As the operating time goes by, the shrinkage will continue to accumulate, gradually leading to the destruction of the sealing structure. When the calcium carbide furnace collapses during operation, carbon monoxide gas will overflow from the damaged seal. At the same time, there will be a fire between the material pipe and the material cap. The fire directly burns the calcium carbide furnace body and its supporting equipment and facilities, shortening the service life of the equipment. In addition, it will cause dust to overflow on site, making the dust concentration in the operating area exceed the standard. This not only damages the working environment, but also affects the respiratory health of the workers. At the same time, the overflowing dust adheres to the surface of the equipment, which greatly increases the workload and difficulty of daily maintenance and cleaning. Utility Model Content

[0004] (a) Technical problems to be solved In order to overcome the above-mentioned defects of the prior art, this utility model provides a novel sealing structure for the feed pipe and cap of a calcium carbide furnace, which solves the problems of sealing failure, gas leakage, equipment burnout, dust pollution and increased maintenance burden caused by the shrinkage of the castable material in the traditional sealing structure mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a novel sealing structure for a feed pipe and cap in a calcium carbide furnace, comprising a cap detachably connected to one end of the feed pipe, multiple nuts welded to the outer surface of the feed pipe, a screw threadedly connected to the inner wall of each nut, and one end of the screw being movable along the axial direction of the feed pipe, a flat flange slidably connected to the outer surface of the feed pipe near the nut, the upper surface of the flat flange abutting against one end of the screw, and the flat flange being movable up and down along the axial direction of the feed pipe, a circular clamp provided on the outer surface of the upper end of the cap, an annular receiving groove provided circumferentially at the upper end of the circular clamp, an asbestos packing provided on the inner wall of the receiving groove, and the upper surfaces of the circular clamp and the asbestos packing abutting against the lower surface of the flat flange.

[0006] Preferably, the plurality of nuts are distributed at equal intervals along the circumferential direction of the outer surface of the feed tube, and the number of nuts is not less than four.

[0007] Preferably, the outer surface of the material cap is provided with a plurality of reinforcing ribs arranged in a ring array along its axis, and each of the reinforcing ribs has a lifting hole on its outer surface, and the number of reinforcing ribs is not less than four.

[0008] Preferably, the thickness of the asbestos packing is greater than the depth of the receiving groove, and the compression amount of the asbestos packing is 15%-30% of its thickness.

[0009] Preferably, a knob is fixedly connected to the end of the screw away from the planar flange, and the outer surface of the knob is provided with anti-slip texture.

[0010] Preferably, the reinforcing rib is a rectangular sheet structure with a thickness of 6mm-10mm and a width of 20mm-30mm, and the lifting hole is a circular hole with a diameter of 15mm-20mm, and the edge of the lifting hole is rounded.

[0011] Preferably, the feed tube has a hollow tubular structure.

[0012] (III) Beneficial Effects This utility model provides a novel sealing structure for the feed pipe and cap of a calcium carbide furnace, which has the following beneficial effects: This novel sealing structure for the feed pipe and cap of a calcium carbide furnace, achieved through the coordinated arrangement of nuts, screws, a flat flange, asbestos packing, and circular clamps, enables a highly efficient and reliable sealing effect. During use, the asbestos packing's elastic deformation seals and blocks leakage channels. When the flat flange is pressed downwards, the asbestos packing, subjected to vertical pressure, undergoes compression deformation. This deformation allows it to tightly adhere to the lower surface of the flat flange, the wall of the receiving groove, and the connection between the cap and the feed pipe, completely filling the tiny gaps at the connection and forming a continuous sealing ring. This successfully solves the problem of carbon monoxide leakage alarms on-site, eliminating safety hazards, ensuring a safe and stable production environment, and effectively improving dust spillage. This significantly enhances on-site working conditions, creating a better working environment for operators, significantly reducing maintenance time and the labor intensity of maintenance personnel, improving maintenance efficiency, and alleviating personnel burden. Furthermore, the high-temperature resistance of the asbestos material allows it to withstand the high temperatures of the feed pipe's outer wall during calcium carbide furnace operation, preventing sealing element failure due to high temperatures and ensuring sealing stability during long-term use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the material cap structure of this utility model; Figure 3 This is a schematic diagram of the circular pipe clamp structure of this utility model.

[0014] In the diagram: 1. Material pipe; 2. Material cap; 3. Nut; 4. Screw; 5. Flat flange; 6. Circular pipe clamp; 7. Receiving groove; 8. Asbestos packing; 9. Reinforcing rib; 10. Lifting hole; 11. Knob. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0016] Example 1: Please refer to Figure 1 and Figure 3This utility model provides a technical solution: a novel sealing structure for a feed pipe and cap in a calcium carbide furnace, comprising a cap 2 detachably connected to one end of the feed pipe 1. The feed pipe 1 has a hollow tubular structure, and multiple nuts 3 are welded to the outer surface of the feed pipe 1. The multiple nuts 3 are evenly distributed along the circumference of the outer surface of the feed pipe 1, and the number of nuts 3 is not less than 4. Each nut 3 has a threaded screw 4 connected to its inner wall. A knob 11 is fixedly connected to the end of the screw 4 away from the flat flange 5. The outer surface of the knob 11 is provided with anti-slip texture, and one end of the screw 4 can move axially along the feed pipe 1. A flat flange 5 is slidably connected to the outer surface of the material pipe 1 near the nut 3. The upper surface of the flat flange 5 abuts against one end of the screw 4, and the flat flange 5 can move up and down along the axial direction of the material pipe 1. A circular tube clamp 6 is provided on the outer surface of the upper end of the material cap 2. An annular receiving groove 7 is opened circumferentially at the upper end of the circular tube clamp 6. An asbestos packing 8 is provided on the inner wall of the receiving groove 7. The upper surfaces of the circular tube clamp 6 and the asbestos packing 8 abut against the lower surface of the flat flange 5. The thickness of the asbestos packing 8 is greater than the depth of the receiving groove 7, and the compression of the asbestos packing 8 is 15%-30% of its thickness. Through the above technical solution, during use, the hollow tubular material pipe 1 can transport the raw materials required by the calcium carbide furnace from the silo to the furnace. The nuts 3, through a multi-point, evenly distributed tightening method, ensure that the pressure of the flat flange 5 on the asbestos packing 8 below is evenly transmitted along the circumference, avoiding insufficient local pressure leading to sealing gaps or excessive local pressure damaging the asbestos packing 8. This ensures sealing reliability through balanced force distribution. Furthermore, if the number of nuts is less than four, the flat flange 5 is prone to force misalignment, leading to sealing failure. Simultaneously, by rotating the knob 11 at the upper end of the screw 4, the screw 4 can be moved axially forward and backward, thereby pushing the flat flange 5 downward to compress the asbestos packing 8, achieving precise control of the sealing pressure. At the same time, the knob 11 increases the hand contact area, making adjustment easier for the operator. Effortless operation and anti-slip texture increase the friction between the hand and the knob 11, preventing slippage during adjustment and improving ease of operation and safety. The circular clamp 6 is located on the upper outer surface of the cap 2, with an annular receiving groove 7 at the upper end. The receiving groove 7 serves as a positioning carrier for the asbestos packing 8, fixing its position and preventing it from shifting or falling off during sealing. This ensures that the sealing element is always in the effective working area. At the same time, the thickness of the asbestos packing 8 is greater than the depth of the receiving groove 7, and the thickness difference provides space for the compression deformation of the asbestos packing 8. A compression amount of 15%-30% can achieve an optimal balance between sealing effect and service life. Insufficient compression will result in incomplete filling of the gap and seal failure, while excessive compression will accelerate the wear of the asbestos packing 8 and shorten the replacement cycle.

[0017] Example 2: Please refer to Figure 1 and Figure 2Based on Embodiment 1, this utility model provides a technical solution in which multiple reinforcing ribs 9 are arranged in a ring array along the axis of the outer surface of the cap 2. Each reinforcing rib 9 has a lifting hole 10 on its outer surface. The number of reinforcing ribs 9 is not less than 4. The reinforcing ribs 9 are rectangular sheet structures with a thickness of 6mm-10mm and a width of 20mm-30mm. The lifting hole 10 is a circular hole with a diameter of 15mm-20mm. The edges of the lifting hole 10 are rounded. Through the above technical solution, the multiple reinforcing ribs 9 on the outer surface of the material cap 2 can serve as a reinforcing structure for the material cap 2. This addresses the issue of the material cap 2 being susceptible to material impact and high-temperature baking during the feeding of materials into the calcium carbide furnace. By distributing stress through a ring array, the material cap 2 is prevented from cracking or deforming, ensuring the long-term stable operation of the sealing structure. At the same time, the thickness of the reinforcing ribs 9 is 6mm-10mm and the width is 20mm-30mm, striking a balance between lightweight and structural strength. This avoids the material cap 2 being too heavy and affecting assembly. The number of ribs is no less than 4 and they are arranged in a ring array to ensure that the material cap 2 is subjected to uniform force in all directions without any local weak areas. When the material cap 2 is difficult to manually disassemble after feeding due to high temperature or dust adhesion, the lifting hole 10 can be hooked with tools such as hooks or ropes to achieve quick separation of the material cap 2 from the material tube 1. Meanwhile, the rounded corner design can prevent operators' hands from being scratched or tools from being damaged during disassembly and assembly, improving operational safety.

[0018] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power via standard interfaces. The main controller can be any commercially available known device. There are no special restrictions on the specific models of the electrical components; any commercially available ordinary products can be selected, as long as they meet the usage requirements of this utility model.

[0019] In this invention, the working steps of the device are as follows: First, fix the circular clamp 6 to the outer surface of the upper end of the cap 2. Embed the asbestos packing 8 into the annular receiving groove 7 of the circular clamp 6, ensuring that the asbestos packing 8 is completely filled along the circumference without gaps or overlaps. Holding the reinforcing rib 9 on the outer surface of the cap 2, align the cap 2 with the end interface of the pipe 1 and slowly insert or connect it, ensuring that the two are coaxial to avoid uneven sealing pressure caused by eccentricity. Following the principle of circumferential symmetry, rotate the knob 11 at the end of each screw 4 in sequence, so that the lower end of the screw 4 slowly contacts the upper surface of the flat flange 5. Rotate each knob 11 1 to 2 turns, and continue to rotate the knobs 11 in a symmetrical order. After rotating each knob 11... Observe the compression state of the asbestos packing 8 by the flat flange 5, and observe the change in packing thickness through the edge of the receiving groove 7 until the compression reaches 15%-30% of its original thickness. During the pressurization process, touch the flat flange 5 to see if it is level. If it is found to be tilted, the corresponding screw 4 needs to be adjusted to ensure that the flat flange 5 is parallel to the upper surface of the asbestos packing 8, so as to avoid local over-compression or poor sealing. After the initial pressurization is completed, wait 5-10 minutes to allow the asbestos packing 8 to fully deform and stabilize under pressure. Check the tightness of each knob 11 again in a symmetrical order, and add half a turn to any loose screw 4 to ensure stable pressure during long-term use.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel sealing structure for a feed pipe and cap in a calcium carbide furnace, comprising a cap (2) detachably connected to one end of the feed pipe (1), characterized in that: The outer surface of the material pipe (1) is welded with a plurality of nuts (3), and each nut (3) has a screw (4) threadedly connected to its inner wall. One end of the screw (4) can move along the axial direction of the material pipe (1). A flat flange (5) is slidably connected to the outer surface of the material pipe (1) near the nut (3). The upper surface of the flat flange (5) abuts against one end of the screw (4), and the flat flange (5) can move up and down along the axial direction of the material pipe (1). A circular tube clamp (6) is provided on the outer surface of the upper end of the material cap (2). An annular receiving groove (7) is opened on the upper end of the circular tube clamp (6) along the circumferential direction. An asbestos packing (8) is provided on the inner wall of the receiving groove (7). The upper surfaces of the circular tube clamp (6) and the asbestos packing (8) abut against the lower surface of the flat flange (5).

2. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 1, characterized in that: Multiple nuts (3) are distributed at equal intervals along the outer surface of the material tube (1), and the number of nuts (3) is not less than 4.

3. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 1, characterized in that: The outer surface of the cap (2) is provided with a plurality of reinforcing ribs (9) arranged in a ring array along its axis. Each of the reinforcing ribs (9) has a lifting hole (10) on its outer surface. The number of reinforcing ribs (9) is not less than 4.

4. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 1, characterized in that: The thickness of the asbestos packing (8) is greater than the depth of the receiving groove (7), and the compression of the asbestos packing (8) is 15%-30% of its thickness.

5. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 1, characterized in that: A knob (11) is fixedly connected to one end of the screw (4) away from the flat flange (5), and the outer surface of the knob (11) is provided with anti-slip texture.

6. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 3, characterized in that: The reinforcing rib (9) has a rectangular sheet structure with a thickness of 6mm-10mm and a width of 20mm-30mm. The lifting hole (10) is a circular hole with a diameter of 15mm-20mm, and the edge of the lifting hole (10) is rounded.

7. The novel sealing structure for the feed pipe and cap of a calcium carbide furnace according to claim 1, characterized in that: The material tube (1) has a hollow tubular structure.

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