Connecting device of bottom electrode and short net, direct current submerged arc furnace and connecting method

Abstract

The invention relates to the technical field of direct current submerged arc furnaces, in particular to a connecting device of a bottom electrode and a short net, the direct current submerged arc furnace and a connecting method.The connecting device is internally provided with a frame component and at least four connecting components of the same structure, and the connecting components are evenly arranged in the circumferential direction of the frame component; each connecting component comprises a clamping assembly and an adjusting assembly, the clamping assembly is installed on the inner side of the frame component, the two ends of the inner side of the clamping assembly are used for the bottom electrode and the short net respectively so that the bottom electrode can be electrically connected with the short net, and the fixed end of the adjusting assembly is fixedly installed on the outer side of the frame component; the telescopic end extends into the frame component to be connected with the outer side of the clamping component, and is used for adjusting the distance between the inner sides of the clamping components of the connecting components through the telescopic end; therefore, the clamping assemblies can be separated from the bottom electrode and the short net only by adjusting the positions of the corresponding clamping assemblies through the adjusting assemblies of the connecting components, so that the inspection and maintenance time of the bottom electrode and the short net is shortened, and the inspection and maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of DC submerged arc furnaces, and particularly to a connecting device for a bottom electrode and a short circuit, a DC submerged arc furnace and a connecting method. Background Art

[0002] A DC submerged arc furnace is an industrial furnace device that uses a DC power source as the energy input and realizes high-temperature smelting of ores through the resistance heating effect, and is widely used in fields such as metallurgy and chemical industry. As a high-temperature smelting device, the submerged arc furnace introduces a strong current into the furnace through the top electrode and the bottom electrode, so as to generate a large amount of Joule heat under the action of the resistance of the furnace charge, meeting the reaction requirements such as melting and reduction of the materials. As a key link connecting the power source and the conductive system in the furnace, the reliability of the connection between the bottom electrode and the short circuit will directly affect the power transmission efficiency and the operation safety of the submerged arc furnace; at present, the mainstream connection method between the bottom electrode and the short circuit of the submerged arc furnace is bolt fastening, and the bottom electrode and the connecting plate of the short circuit are fixedly connected through conductive bolts to realize the electrical connection between the bottom electrode and the short circuit.

[0003] Since the submerged arc furnace operates in a high-temperature, high-load, strong-corrosion and vibration environment for a long time, problems such as oxidation rust and bolt loosening are likely to occur at the connection between the bottom electrode and the short circuit, resulting in an increase in the contact resistance between the bottom electrode and the short circuit, causing problems such as overheating at the connection and an increase in the energy consumption of the submerged arc furnace; at the same time, cracks and wear will occur in the bottom electrode and the short circuit under the action of thermal stress, posing safety hazards such as short circuits and furnace leakage, and further affecting the stability of the submerged arc furnace smelting. Therefore, it is necessary to regularly inspect, repair and maintain the bottom electrode and the short circuit of the submerged arc furnace.

[0004] The existing bolt fastening connection method has the following problems in the inspection, repair and maintenance process: the mechanical fixation between the bottom electrode and the short circuit depends on multiple groups of bolts. However, the bolts are in a high-temperature, high-load, strong-corrosion and vibration environment for a long time, and the surface is prone to rust, resulting in difficult disassembly by operators, prolonging the inspection, repair and maintenance time, and reducing the inspection, repair and maintenance efficiency. Summary of the Invention

[0005] In view of this, it is necessary to provide a connecting device for a bottom electrode and a short circuit, a DC submerged arc furnace and a connecting method, which can shorten the inspection, repair and maintenance time of the bottom electrode and the short circuit and improve the inspection, repair and maintenance efficiency.

[0006] In a first aspect, the present invention provides a connection device for a bottom electrode and a short circuit, comprising a frame member and at least four connection members with the same structure. Each connection member is uniformly arranged along the circumferential direction of the frame member. Each connection member includes a clamping assembly and an adjustment assembly. The clamping assembly is installed inside the frame member. One end inside the clamping assembly is used to clamp the bottom electrode, and the other end is used to clamp the short circuit, so that the bottom electrode and the short circuit are electrically connected. The fixed end of the adjustment assembly is fixedly installed outside the frame member, and the telescopic end extends into the frame member and is connected to the outside of the clamping assembly, and is used to adjust the distance between the inner sides of the clamping assemblies of each connection member through the telescopic end, so that the clamping assembly can perform a clamping operation or a loosening operation on the bottom electrode and the short circuit.

[0007] Preferably, the shape of the frame member is adapted to the shape of the bottom electrode and satisfies that a certain number of connection members can be installed on the frame member, so that the connection members can clamp from different surfaces of the bottom electrode.

[0008] Preferably, the clamping assembly includes a first clamping member, a second clamping member and at least one connecting member. The inner side of the first clamping member is used to clamp the bottom electrode, and the inner side of the second clamping member is used to clamp the short circuit. Both ends of each connecting member are fixedly connected to the first clamping member and the second clamping member respectively to electrically connect the first clamping member and the second clamping member.

[0009] Preferably, both the first clamping member and the second clamping member are provided with a liquid inlet and a liquid outlet. The liquid inlet is used to introduce a coolant into the first clamping member or the second clamping member, and the liquid outlet is used to discharge the coolant in the first clamping member or the second clamping member, so as to cool the first clamping member and the second clamping member by circulating the coolant.

[0010] Preferably, the adjustment assembly includes a telescopic member, a fixing plate and at least two mounting members. The fixed end of the telescopic member is fixedly installed on the outer edge of the frame member, and the telescopic end of the telescopic member extends into the frame member and is fixedly connected to the fixing plate. Both sides of the fixing plate are fixedly connected to the side surfaces of at least one mounting member. The bottom surface of each mounting member is elastically connected to the top surface of the first clamping member or the second clamping member, and is used to adapt to the expansion deformation of the bottom electrode or the short circuit under high temperature working conditions, so that the first clamping member can clamp the bottom electrode and the second clamping member can clamp the short circuit.

[0011] Preferably, at least one spring group is installed on the bottom surface of each mounting member. Each spring group includes a first fixing member, a second fixing member, a telescopic rod, and a spring member. The top surface of the first fixing member is fixedly connected to the bottom surface of the mounting member. A telescopic cylinder is provided on the bottom surface. One end of the telescopic rod is slidably connected to the telescopic cylinder, and the other end is fixedly connected to the top surface of the second fixing member, so as to adjust the distance between the first fixing member and the second fixing member by adjusting the length of the telescopic rod extending out of the telescopic cylinder. The bottom surface of the second fixing member is rotatably connected to the top surface of a first clamping member or a second clamping member. The spring member is sleeved on the telescopic rod, and both ends are respectively fixedly connected to the bottom surface of the first fixing member and the top surface of the second fixing member, so that the telescopic rod extends out of the telescopic cylinder under the action of the spring member.

[0012] Preferably, a connection hole is provided on the bottom surface of the second fixing member. At least one rotating group is evenly provided on the top surfaces of the first clamping member and the second clamping member. The number of rotating groups is the same as the number of spring groups. The rotating group includes two connecting plates and a connecting rod. The two connecting plates are symmetrically arranged. Both ends of the connecting rod are fixedly connected to the two connecting plates respectively. The connecting rod is also rotatably connected to the connection hole.

[0013] Preferably, each connecting member is made of a flexible conductive material, so that the distance between the first clamping member and the second clamping member can change adaptively.

[0014] In a second aspect, the present invention provides a DC submerged arc furnace, including a submerged arc furnace body, N bottom electrodes, N short networks, and N connection devices for the bottom electrodes and the short networks as described in the first aspect. Each bottom electrode is evenly installed at the bottom of the submerged arc furnace body. Each short network is arranged opposite to a bottom electrode. The connection devices for the bottom electrodes and the short networks are evenly installed on the outer side of the submerged arc furnace body, and each connection device for the bottom electrode and the short network is arranged opposite to a bottom electrode, for electrically connecting the bottom electrode and the short network; wherein, N≥1.

[0015] In a third aspect, the present invention provides a connection method for a bottom electrode and a short network. The bottom electrode and the short network are connected by the connection device for the bottom electrode and the short network as described in the first aspect, including the following steps: S1. Frame members with the same number as the bottom electrodes are arranged on the outer wall of the submerged arc furnace, and it is ensured that the center of each frame member and the center of the bottom electrode are on the same central axis to establish a rigid reference platform; S2. Connection members are arranged on the surfaces of the frame members facing the outer surfaces of the bottom electrodes; and it is ensured that the first clamping member of each clamping assembly in the connection members faces a surface of the outer surface of the bottom electrode, and the second clamping member of each clamping assembly faces a surface of the outer surface of the short network; S3. Adjust the clamping force of the corresponding clamping components on the bottom electrode or the short circuit by each adjustment component, so that the first clamping piece of each clamping component closely fits the outer surface of the bottom electrode, and the second clamping piece closely fits the outer surface of the short circuit, so as to electrically connect the bottom electrode and the short circuit.

[0016] In the above connection device of the bottom electrode and the short circuit, there are a frame member and at least four connection members with the same structure. Each connection member is evenly arranged along the circumferential direction of the frame member. Each connection member includes a clamping component and an adjustment component. The clamping component is installed inside the frame member. One end inside the clamping component is used to clamp the bottom electrode, and the other end is used to clamp the short circuit, so as to electrically connect the bottom electrode and the short circuit. The fixed end of the adjustment component is fixedly installed outside the frame member, and the telescopic end extends into the frame member and is connected to the outside of the clamping component, and is used to adjust the distance between the inner sides of the clamping components of each connection member through the telescopic end, so that the clamping component clamps or loosens the bottom electrode and the short circuit; thus, since the clamping components of each connection member clamp the bottom electrode and the short circuit under the push of the corresponding adjustment component, thereby realizing the electrical connection between the bottom electrode and the short circuit. Therefore, the surface corrosion of the clamping component will not affect the adjustment component. When the operator repairs the bottom electrode and the short circuit of the submerged arc furnace, compared with the traditional bolt fastening connection method, the connection device of the bottom electrode and the short circuit provided by the present invention only needs to adjust the position of the corresponding clamping component through the adjustment component of each connection member to separate the clamping component from the bottom electrode and the short circuit, thereby shortening the inspection and repair time of the bottom electrode and the short circuit and improving the inspection and repair efficiency. Description of the Drawings

[0017] Figure 1 is a perspective view of the connection device of the bottom electrode and the short circuit of the present application.

[0018] Figure 2 is a perspective view of the clamping component of the present application.

[0019] Figure 3 is a perspective view of the adjustment component of the present application.

[0020] Figure 4 is a side view of the spring group of the present application.

[0021] Figure 5 is a perspective view of the DC submerged arc furnace of the present application.

[0022] Figure 6 is a flowchart of the connection method of the present application.

[0023] In the figure: the connecting device 10 between the bottom electrode and the short net, the frame member 20, the connecting member 30, the clamping assembly 31, the first clamping member 311, the second clamping member 312, the connecting member 313, the liquid inlet 314, the liquid outlet 315, the rotating group 316, the connecting plate 3161, the connecting rod 3162, the adjusting assembly 32, the telescopic member 321, the fixing plate 322, the mounting member 323, the spring group 324, the first fixing member 3241, the second fixing member 3242, the telescopic rod 3243, the spring member 3244, the telescopic cylinder 3245, the connecting hole 3246, the DC submerged arc furnace 40, the furnace body 41 of the submerged arc furnace, the bottom electrode 42, and the short net 43. Detailed implementation manners

[0024] The following further elaborates on the technical solutions and technical effects of the embodiments of the present invention in conjunction with the drawings of the present invention.

[0025] Please refer to Figure 1 , in a first aspect, the present invention provides a connecting device 10 between a bottom electrode and a short net, including a frame member 20 and at least four connecting members 30 with the same structure. Each connecting member 30 is uniformly arranged along the circumferential direction of the frame member 20. Each connecting member 30 includes a clamping assembly 31 and an adjusting assembly 32. The clamping assembly 31 is installed inside the frame member 20. One end inside the clamping assembly 31 is used to clamp the bottom electrode 42, and the other end is used to clamp the short net 43, so that the bottom electrode 42 and the short net 43 are electrically connected. The fixed end of the adjusting assembly 32 is fixedly installed outside the frame member 20, and the telescopic end extends into the frame member 20 and is connected to the outside of the clamping assembly 31, and is used to adjust the distance between the inner sides of the clamping assemblies 31 of each connecting member 30 through the telescopic end, so that the clamping assembly 31 clamps or loosens the bottom electrode 42 and the short net 43; thus, since the clamping assemblies 31 of each connecting member 30 clamp the bottom electrode 42 and the short net 43 under the push of the corresponding adjusting assembly 32, the electrical connection between the bottom electrode 42 and the short net 43 is realized. Therefore, the surface rust of the clamping assembly 31 will not affect the adjusting assembly 32. When the operator repairs the bottom electrode 42 and the short net 43 of the submerged arc furnace, compared with the traditional bolt fastening connection method, the connecting device 10 between the bottom electrode and the short net provided by the present invention only needs to adjust the position of the corresponding clamping assembly 31 through the adjusting assembly 32 of each connecting member 30, so that the clamping assembly 31 is separated from the bottom electrode 42 and the short net 43, thereby shortening the inspection and repair time of the bottom electrode 42 and the short net 43 and improving the inspection and repair efficiency.

[0026] Further, the shape of the frame member 20 is adapted to the shape of the bottom electrode 42, and it satisfies that a number of connecting members 30 can be arranged on the frame member 20 so that the connecting members 30 can clamp from different surfaces of the bottom electrode; for example, when the shape of the bottom electrode 42 is square, the shape of the frame member 20 is square, and the number of the connecting members 30 is four.

[0027] In this embodiment, the frame member 20 is made of an insulating material with high temperature resistance, such as alumina ceramics; an insulating structure is provided at the connection between the adjustment assembly 32 and the clamping assembly 31. For example, an insulating coating is applied on the outer side of the clamping assembly 31 or the adjustment assembly 32 is made of an insulating material, etc., to prevent the current leakage between the bottom electrode 42 and the short circuit 43.

[0028] Please refer to Figure 2 , further, the clamping assembly 31 includes a first clamping member 311, a second clamping member 312 and at least one connecting member 313. The inner side of the first clamping member 311 is used to clamp the bottom electrode 42, and the inner side of the second clamping member 312 is used to clamp the short circuit 43. Both ends of each connecting member 313 are fixedly connected to the first clamping member 311 and the second clamping member 312 respectively to electrically connect the first clamping member 311 and the second clamping member 312.

[0029] In this embodiment, the structures of the first clamping member 311 and the second clamping member 312 are the same.

[0030] In this embodiment, each first clamping member 311 and each second clamping member 312 are made of a material with good electrical conductivity, such as copper, so that the power transmission between the short circuit 43 and the bottom electrode 42 is more stable.

[0031] Please refer to Figure 2 , further, the first clamping member 311 and the second clamping member 312 are both provided with a liquid inlet 314 and a liquid outlet 315. The liquid inlet 314 is used to introduce a coolant, such as pure water, into the first clamping member 311 or the second clamping member 312, and the liquid outlet 315 is used to discharge the coolant in the first clamping member 311 or the second clamping member 312, so as to cool the first clamping member 311 and the second clamping member 312 by circulating the coolant, thereby preventing the first clamping member 311 and the second clamping member 312 from deforming at high temperatures.

[0032] Please refer to Figure 3, Further, the adjustment component 32 includes a telescopic member 321, a fixing plate 322, and at least two mounting members 323. The fixed end of the telescopic member 321 is fixedly installed on the outer edge of the frame member 20, and the telescopic end of the telescopic member 321 extends into the frame member 20 and is fixedly connected to the fixing plate 322. Both sides of the fixing plate 322 are fixedly connected to the side surfaces of at least one mounting member 323. The bottom surface of each mounting member 323 is elastically connected to the top surface of the first clamping member 311 or the second clamping member 312, so as to adapt to the expansion deformation of the bottom electrode 42 or the short circuit 43 under high-temperature working conditions, enabling the first clamping member 311 to clamp the bottom electrode 42 and enabling the second clamping member 312 to clamp the short circuit 43; Specifically, since the bottom electrode 42 and the short circuit 43 of the submerged arc furnace are in a high-temperature working condition for a long time, under the action of high temperature, the bottom electrode 42 and the short circuit 43 are prone to expand and deform, resulting in a number of local gaps at the connection between the bottom electrode 42 and the first clamping member 311 and at the connection between the short circuit 43 and the second clamping member 312. As a result, the resistance between the bottom electrode 42 and the short circuit 43 increases, triggering an arc discharge phenomenon, which may lead to equipment failures or safety accidents. In the present invention, by elastically connecting the bottom surface of the mounting member 323 to the top surface of the first clamping member 311 or the second clamping member 312, when the bottom electrode 42 or the short circuit 43 expands and deforms, the first clamping member 311 can move towards the mounting member 323 along with the expansion deformation of the bottom electrode 42, and the second clamping member 312 can move towards the mounting member 323 along with the expansion deformation of the short circuit 43, so as to reduce the number of local gaps at the connection between the bottom electrode 42 and the first clamping member 311 and at the connection between the short circuit 43 and the second clamping member 312, thereby reducing the increase in the resistance between the bottom electrode 42 and the short circuit 43, and thus reducing the occurrence frequency of the arc discharge phenomenon.

[0033] In this embodiment, when cooling the first clamping member 311 and the second clamping member 312 by circulating the coolant, the surface temperatures of the bottom electrode 42 and the short circuit 43 can also be reduced, thereby reducing the expansion deformation amounts of the bottom electrode 42 and the short circuit 43, and reducing the number of local gaps at the connection between the bottom electrode 42 and the first clamping member 311 and at the connection between the short circuit 43 and the second clamping member 312.

[0034] In this embodiment, the telescopic member 321 is a device with a telescopic function, for example, a disc spring hydraulic cylinder.

[0035] Please refer to Figures 3 to 4, Further, at least one spring group 324 is installed on the bottom surface of each mounting member 323. Each spring group 324 includes a first fixing member 3241, a second fixing member 3242, a telescopic rod 3243 and a spring member 3244. The top surface of the first fixing member 3241 is fixedly connected to the bottom surface of the mounting member 323, and a telescopic cylinder 3245 is provided on the bottom surface. One end of the telescopic rod 3243 is slidably connected to the telescopic cylinder 3245, and the other end is fixedly connected to the top surface of the second fixing member 3242, so as to adjust the distance between the first fixing member 3241 and the second fixing member 3242 by adjusting the length of the telescopic rod 3243 extending out of the telescopic cylinder 3245. The bottom surface of the second fixing member 3242 is rotatably connected to the top surface of a first clamping member 311 or a second clamping member 312. The spring member 3244 is sleeved on the telescopic rod 3243, and both ends are fixedly connected to the bottom surface of the first fixing member 3241 and the top surface of the second fixing member 3242 respectively, so that the telescopic rod 3243 extends out of the telescopic cylinder 3245 under the action of the spring member 3244. Thus, when clamping the bottom electrode 42 or the short circuit 43, the first clamping member 311 or the second clamping member 312 can clamp the bottom electrode 42 or the short circuit 43 under the elastic force of the spring member 3244. When the bottom electrode 42 or the short circuit 43 expands and deforms under the action of high temperature, the first clamping member 311 or the second clamping member 312 can move towards the adjustment assembly 32 by compressing the spring member 3244 to adjust the clamping force of the first clamping member 311 or the second clamping member 312 on the bottom electrode 42 or the short circuit 43.

[0036] Please refer to Figure 2 and Figure 4 , Further, a connection hole 3246 is provided on the bottom surface of the second fixing member 3242. At least one rotating group 316 is evenly provided on the top surfaces of the first clamping member 311 and the second clamping member 312. The number of the rotating groups 316 is the same as the number of the spring groups 324. The rotating group 316 includes two connecting plates 3161 and a connecting rod 3162. The two connecting plates 3161 are symmetrically arranged. Both ends of the connecting rod 3162 are fixedly connected to the two connecting plates 3161 respectively, and the connecting rod 3162 is also rotatably connected to the connection hole 3246, so as to realize the rotational connection between the second fixing member 3242 and the first clamping member 311 or the second clamping member 312.

[0037] In this embodiment, since the direction of expansion and deformation of the bottom electrode 42 or the short network 43 is not fixed, by rotatably connecting the second fixing member 3242 with the first clamping member 311 or the second clamping member 312, when the bottom electrode 42 or the short network 43 expands and deforms, the first clamping member 311 or the second clamping member 312 can move in an inclined direction towards the second fixing member 3242, so that the first clamping member 311 fits more closely to the surface of the bottom electrode 42, and at the same time the second clamping member 312 fits more closely to the surface of the short network 43, thereby further reducing the number of local gaps at the connection between the bottom electrode 42 and the first clamping member 311 and at the connection between the short network 43 and the second clamping member 312.

[0038] Furthermore, each connecting member 313 is made of a flexible conductive material, for example, a flexible copper bar, so that the distance between the first clamping member 311 and the second clamping member 312 can change adaptively; this is because the expansion amounts of the bottom electrode 42 and the short network 43 are not the same. Due to the use of the flexible connecting member 313, when the bottom electrode 42 expands and becomes larger at high temperature and drives the first clamping member 311 to move, the corresponding second clamping member 312 will not move accordingly, enabling the second clamping member 312 to clamp the short network 43; when the short network 43 expands and becomes larger at high temperature and drives the second clamping member 312 to move, the corresponding first clamping member 311 will not move accordingly, enabling the first clamping member 311 to clamp the bottom electrode 42; if the connecting member 313 is made of a rigid material, the above functions cannot be achieved.

[0039] Please refer to Figure 5 , in a second aspect, the present invention provides a DC submerged arc furnace 40, including a submerged arc furnace body 41, N bottom electrodes 42, N short networks 43, and N connection devices 10 for connecting the bottom electrode and the short network as in the first aspect. Each bottom electrode 42 is uniformly installed at the bottom of the submerged arc furnace body 41, each short network 43 is arranged opposite to a bottom electrode 42, and each connection device 10 for connecting the bottom electrode and the short network is uniformly installed outside the submerged arc furnace body 41, and each connection device 10 for connecting the bottom electrode and the short network is opposite to a bottom electrode 42 for electrically connecting the bottom electrode 42 and the short network 43; where N≥1.

[0040] Please refer to Figure 6 , in a third aspect, the present invention provides a method for connecting a bottom electrode and a short network. The bottom electrode 42 and the short network 43 are connected by the connection device 10 for connecting the bottom electrode and the short network as in the first aspect, including the following steps: S1. Set frame members 20 on the outer wall of the submerged arc furnace, the number of which is the same as that of the bottom electrodes 42, and ensure that the centers of each frame member 20 and the bottom electrodes 42 are on the same central axis to establish a rigid reference platform, thereby ensuring that the connecting members 30 installed on the frame members 20 can stably connect the bottom electrodes 42 and the short net 43; S2. Set connecting members 30 on each surface of the frame member 20 facing the outer surface of the bottom electrode 42; and ensure that the first clamping member 311 of each clamping assembly 31 in the connecting member 30 faces a surface of the outer surface of the bottom electrode 42, and the second clamping member 312 of each clamping assembly 31 faces a surface of the outer surface of the short net 43; S3. Adjust the clamping force of the corresponding clamping assembly 31 on the bottom electrode 42 or the short net 43 through each adjustment assembly 32, so that the first clamping member 311 of each clamping assembly 31 closely fits the outer surface of the bottom electrode 42, and the second clamping member 312 closely fits the outer surface of the short net 43, so that the bottom electrode 42 and the short net 43 are electrically connected; Example 1, usage method of the connecting device 10 between the bottom electrode and the short net 1. Set frame members 20 on the outer wall of the submerged arc furnace, the number of which is the same as that of the bottom electrodes 42, and ensure that the centers of each frame member 20 and the bottom electrodes 42 are on the same central axis; 2. Set connecting members 30 on each surface of the frame member 20 facing the outer surface of the bottom electrode 42, and ensure that the first clamping member 311 of each clamping assembly 31 in the connecting member 20 faces a surface of the outer surface of the bottom electrode 42, and the second clamping member 312 of each clamping assembly 31 faces a surface of the outer surface of the short net 43; 3. Adjust the position of the fixing plate 322 by the telescopic member 321 of each adjustment assembly 32 to adjust the positions of the corresponding first clamping member 311 and the second clamping member 312, so that the first clamping member 311 closely fits the outer surface of the bottom electrode 42, and the second clamping member 312 closely fits the outer surface of the short net 43 to realize the connection between the bottom electrode 42 and the short net 43; or separate the first clamping member 311 from the outer surface of the bottom electrode 42, and separate the second clamping member 312 from the outer surface of the short net 43 to realize the separation between the bottom electrode 42 and the short net 43, so as to facilitate the inspection, repair and maintenance of the bottom electrode 42 and the short net 43 by the operator.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connecting device for the bottom electrode and the short net of a DC submerged arc furnace, characterized in that It includes a frame member and at least four connecting members with the same structure. Each connecting member is evenly arranged along the circumferential direction of the frame member. Each connecting member includes a clamping assembly and an adjusting assembly. The clamping assembly is installed on the inner side of the frame member. One end of the inner side of the clamping assembly is used to clamp the bottom electrode, and the other end is used to clamp the short net, so that the bottom electrode and the short net are electrically connected. The fixed end of the adjusting assembly is fixedly installed on the outer side of the frame member, and the telescopic end extends into the frame member and is connected to the outer side of the clamping assembly, and is used to adjust the distance between the inner sides of the clamping assemblies of each connecting member through the telescopic end, so that the clamping assembly clamps or loosens the bottom electrode and the short net.

2. The connecting device of the bottom electrode and the short net of the DC submerged arc furnace according to claim 1, characterized in that, The shape of the frame member is adapted to the shape of the bottom electrode and satisfies that a certain number of connecting members can be installed on the frame member so that the connecting members can clamp from different surfaces of the bottom electrode.

3. The connection device between the bottom electrode and the short network of the DC submerged arc furnace according to claim 1, characterized in that, The clamping assembly includes a first clamping member, a second clamping member and at least one connecting member. The inner side of the first clamping member is used to clamp the bottom electrode, and the inner side of the second clamping member is used to clamp the short net. Both ends of each connecting member are fixedly connected to the first clamping member and the second clamping member respectively to electrically connect the first clamping member and the second clamping member.

4. The connection device between the bottom electrode and the short net of the DC submerged arc furnace according to claim 3, characterized in that, Both the first clamping member and the second clamping member are provided with a liquid inlet and a liquid outlet. The liquid inlet is used to introduce cooling liquid into the first clamping member or the second clamping member, and the liquid outlet is used to discharge the cooling liquid in the first clamping member or the second clamping member, so as to cool the first clamping member and the second clamping member by circulating the cooling liquid.

5. The connection device between the bottom electrode and the short net of the DC submerged arc furnace according to claim 3, characterized in that The adjusting assembly includes a telescopic member, a fixing plate and at least two mounting members. The fixed end of the telescopic member is fixedly installed on the outer edge of the frame member, and the telescopic end of the telescopic member extends into the frame member and is fixedly connected to the fixing plate. Both sides of the fixing plate are fixedly connected to the side surfaces of at least one mounting member. The bottom surface of each mounting member is elastically connected to the top surface of the first clamping member or the second clamping member, and is used to adapt to the expansion deformation of the bottom electrode or the short net under high-temperature working conditions, so that the first clamping member can clamp the bottom electrode and the second clamping member can clamp the short net.

6. The connection device of the bottom electrode and the short net of the DC submerged arc furnace according to claim 5, characterized in that, At least one spring group is installed on the bottom surface of each mounting member. Each spring group includes a first fixing member, a second fixing member, a telescopic rod and a spring member. The top surface of the first fixing member is fixedly connected to the bottom surface of the mounting member, and a telescopic cylinder is provided on the bottom surface. One end of the telescopic rod is slidably connected to the telescopic cylinder, and the other end is fixedly connected to the top surface of the second fixing member, so as to adjust the distance between the first fixing member and the second fixing member by adjusting the length of the telescopic rod extending out of the telescopic cylinder. The bottom surface of the second fixing member is rotatably connected to the top surface of a first clamping member or a second clamping member. The spring member is sleeved on the telescopic rod, and both ends are fixedly connected to the bottom surface of the first fixing member and the top surface of the second fixing member respectively, so that the telescopic rod extends out of the telescopic cylinder under the action of the spring member.

7. The connecting device between the bottom electrode and the short net of the DC submerged arc furnace according to claim 6, characterized in that, The bottom surface of the second fixing member is provided with a connection hole. At least one rotating group is evenly arranged on the top surfaces of the first clamping member and the second clamping member. The number of the rotating groups is the same as that of the spring groups. The rotating group includes two connecting plates and a connecting rod. The two connecting plates are symmetrically arranged. The two ends of the connecting rod are respectively fixedly connected with the two connecting plates. The connecting rod is also rotatably connected with the connection hole.

8. The connection device between the bottom electrode and the short network of the DC submerged arc furnace according to claim 7, characterized in that, Each connecting member is made of a flexible conductive material so that the distance between the first clamping member and the second clamping member can be adaptively changed.

9. A DC submerged arc furnace, characterized in that, It includes a submerged arc furnace body, N bottom electrodes, N short circuits, and N connection devices for the bottom electrodes and the short circuits as described in any one of claims 1 to 8. Each bottom electrode is evenly installed at the bottom of the submerged arc furnace body. Each short circuit is arranged opposite to a bottom electrode. The connection devices for the bottom electrodes and the short circuits are evenly installed on the outer side of the submerged arc furnace body. And each connection device for the bottom electrode and the short circuit is arranged opposite to a bottom electrode for electrically connecting the bottom electrode and the short circuit; where N≥1.

10. A connection method between a bottom electrode and a short net, wherein the bottom electrode and the short net are connected by the connection device between the bottom electrode and the short net according to any one of claims 1 to 8, characterized in that, It includes the following steps: S1. Set frame members with the same number as the bottom electrodes on the outer wall of the submerged arc furnace, and ensure that the centers of each frame member and the bottom electrodes are on the same central axis to establish a rigid reference platform. S2. Set connection members on the surfaces of the frame members facing the outer surfaces of the bottom electrodes; and ensure that the first clamping member of each clamping assembly in the connection members faces one surface of the outer surface of the bottom electrode, and the second clamping member of each clamping assembly faces one surface of the outer surface of the short circuit. S3. Adjust the clamping force of the corresponding clamping assembly on the bottom electrode or the short circuit through each adjustment assembly, so that the first clamping member of each clamping assembly closely fits the outer surface of the bottom electrode, and the second clamping member closely fits the outer surface of the short circuit, so as to electrically connect the bottom electrode and the short circuit.

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