Vacuum electric arc furnace for titanium ingot smelting forming

Abstract

The invention provides a vacuum electric arc furnace for titanium ingot smelting forming, and relates to the technical field of vacuum electric arc furnaces, the vacuum electric arc furnace comprises an outer frame arranged on the ground, an inner frame is slidably arranged in the middle of the outer frame, a hydraulic cylinder is fixed to the top of the inner frame through an insulating plate, and a sealing cover is fixed to the bottom of the inner frame; a conductive material rod is fixed to the telescopic end of the hydraulic cylinder, the outer surface of the conductive material rod is electrically connected with a cathode of the smelting power source, and the bottom end of the conductive material rod extends into the sealing cover. According to the vacuum electric arc furnace for titanium ingot smelting forming, through the arrangement of the conductive material rod, a titanium column can be clamped conveniently, the electric connection effect between the conductive material rod and the titanium column can be guaranteed, in addition, a small section of remaining tailings after the titanium column is molten can be conveniently taken down from the bottom end of the conductive material rod, and therefore the titanium column can be conveniently subjected to smelting forming. And the smelting quality of titanium ingots and the convenience of smelting operation are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum arc furnaces, in particular to a vacuum arc furnace for smelting and forming titanium ingots. BACKGROUND

[0002] An arc furnace is a device that uses the high temperature generated by an electric arc to melt metals. It has a large power consumption when it is working, and the energy is very concentrated when an arc is formed between two electrodes, with a temperature above 3000℃ in the arc area. It is commonly used to smelt metals with high melting points.

[0003] Titanium is a chemically active metal at high temperatures. In order to maintain its purity, a vacuum consumable arc furnace is often used to smelt titanium ingots. A vacuum consumable arc furnace uses a small-diameter titanium column as a consumable electrode and is electrically connected to the cathode of a smelting power source. The titanium column is used as the smelting raw material and is placed in a copper crucible in a vacuum state. The copper crucible is electrically connected to the anode of the smelting power source. When the smelting power source is turned on, an arc is formed between the bottom end of the titanium column and the inner bottom wall of the copper crucible, causing the bottom end of the titanium column to continuously melt. At the same time, the molten titanium drips into the water-cooled copper crucible and solidifies into a larger-diameter titanium ingot, which is used to process larger-sized titanium parts. In addition, the titanium column continuously descends during smelting to maintain a reasonable arc gap between the bottom end of the titanium column and the molten titanium.

[0004] Based on the above, the titanium column (consumable electrode) needs to have lifting capability during smelting and needs to be electrically connected to the cathode of the smelting power source. Currently, the vacuum consumable arc furnace is generally used by welding the titanium column to the bottom end of the conductive lifting rod (material rod). After the titanium column is completely melted, the remaining small section of tail material is difficult to remove because it is welded to the bottom end of the conductive lifting rod. It needs to be cut and polished before the next smelting operation, which is troublesome to operate. In the prior art, a T-shaped insertion rod and a clamping seat are used to achieve electrical connection between the titanium column and the conductive lifting rod (see the technical solution disclosed in patent CN119737764A). In use, the T-shaped insertion rod is first welded to the top end of the titanium column, and then the top end of the T-shaped insertion rod is clamped in the clamping seat. However, this solution still requires welding operations and cannot guarantee the contact effect between the top end of the T-shaped insertion rod and the clamping seat, resulting in large contact resistance and poor electrical connection, which affects the smelting quality. In addition, during smelting, the large smelting current between the T-shaped insertion rod and the clamping seat can cause a large temperature accumulation, which can easily cause the phenomenon of contact welding, and it is also difficult to remove the remaining titanium column tail material.

[0005] In addition, since the melting point of titanium is high, the temperature in the red copper crucible during smelting operation is as high as thousands of degrees Celsius, which is much higher than the heat-resistant temperature of the spring in the current technology. Therefore, the clamping mechanism between the T-shaped insertion rod and the clamping seat cannot use a spring, because the temperature is too high, the heat-resistant temperature of hydraulic oil is limited, and it is also difficult to use hydraulic components for clamping and fixing. Therefore, based on the above-mentioned "fixing problem and electrical connection problem between the titanium column and the conductive lifting rod, which leads to the difficulty in removing the remaining titanium column", the vacuum arc furnace also needs to be improved.

[0006] Therefore, a vacuum arc furnace for smelting and forming of titanium ingot is provided. SUMMARY

[0007] The present application makes up for the shortcomings of the prior art, and provides a vacuum arc furnace for smelting and forming of titanium ingot. The conductive material rod is arranged to facilitate clamping of the titanium column and to ensure the electrical connection effect between the conductive material rod and the titanium column. In addition, it is also convenient to take out the remaining small amount of tail material from the bottom end of the conductive material rod after the titanium column is melted.

[0008] The present application provides the following technical solution to solve the above technical problems: a vacuum arc furnace for smelting and forming of titanium ingot, comprising an outer frame arranged on the ground, an inner frame slidingly arranged in the middle of the outer frame, and a hydraulic component arranged between the inner frame and the outer frame to provide power, so that the inner frame can slide up and down in the middle of the outer frame. This can be implemented by combining conventional technology.

[0009] The top of the inner frame is fixed with a hydraulic cylinder through an insulating plate, the bottom of the inner frame is fixed with a sealing cover, the extension end of the hydraulic cylinder is fixed with a conductive material rod, the outer surface of the conductive material rod is electrically connected with the cathode of a smelting power source, and the bottom end of the conductive material rod extends to the inside of the sealing cover.

[0010] A cooling and sealing assembly is arranged between the outer surface of the conductive material rod and the top of the sealing cover.

[0011] Specifically, the cooling and sealing assembly comprises a water-cooling sleeve and a sealing sleeve slidingly sleeved on the outer surface of the conductive material rod, the sealing sleeve is fixed on the upper surface of the water-cooling sleeve, and the water-cooling sleeve is fixed on the top surface of the sealing cover through a heat-insulating and insulating block.

[0012] A cleaning ring is further installed in the inside of the sealing sleeve, and the cleaning ring is slidingly sleeved on the outer surface of the conductive material rod.

[0013] A table cylinder fixed on the ground is further included, one end of the inner frame is rotatably installed on the top of the table cylinder, the other end of the inner frame is installed with a group of pulleys, and the pulleys are driven by a motor.

[0014] The anode contact seat is arranged on the ground and the copper crucible is arranged under the ground, the anode contact seat is electrically connected with the anode of the smelting power source, the anode contact seat is used for sealing between the sealing cover and the copper crucible and electrically connecting the copper crucible with the anode of the smelting power source, the middle part of the sealing cover is further fixedly connected with a negative pressure pipeline for vacuumizing, and the negative pressure pipeline is connected with an external vacuumizing device.

[0015] The conductive material rod is electrically connected with the cathode of the smelting power source, the bottom of the conductive material rod can hold the titanium column, the middle part of the conductive material rod is provided with a sliding hole extending to the bottom end surface of the conductive material rod, a sliding cylinder is arranged in the sliding hole, a sliding rod is arranged in the sliding cylinder, a compression spring is arranged between the top end of the sliding rod and the inner top wall of the sliding cylinder, a limiting groove is arranged in the inner wall of the bottom end of the sliding hole, a graphite block is arranged in the inner wall of the bottom end of the sliding hole, a plurality of tin melting holes for inserting tin bars are arranged in the bottom surface of the graphite block, and the bottom end of the sliding rod extends to the lower side of the sliding cylinder, is clamped in the limiting groove and is fixedly arranged on the graphite block.

[0016] The sliding hole, the sliding cylinder and the sliding rod are connected through the sliding key and the sliding key groove to avoid mutual rotation.

[0017] A plurality of strip holes are arranged in the bottom end of the conductive material rod in a circumferential array about the axis, a counterweight ring is arranged on the outer surface of the bottom end of the conductive material rod, a plurality of plug-in pieces corresponding to the positions of the strip holes are arranged at the bottom end of the counterweight ring, a plurality of material extraction holes corresponding to the positions of the strip holes are arranged in the middle part of each plug-in piece, a plurality of extrusion rods are arranged in each strip hole, one end of each extrusion rod is hinged to the bottom end of the sliding cylinder, one end of each extrusion rod away from the other extrusion rods penetrates the material extraction hole and is hinged to a clamping rod, the middle part of the clamping rod is hinged to the outer surface of the bottom end of the conductive material rod, the top end of the clamping rod is inclined to one side of the conductive material rod, and a tungsten steel chuck is arranged at the bottom end of the clamping rod.

[0018] A piston block is arranged in the top part of the sliding hole, a hydraulic chamber is formed between the piston block and the top end of the sliding hole, the hydraulic chamber is connected with an external hydraulic mechanism through a hydraulic pipe, a piston rod is arranged at the bottom end of the piston block, and a push-pull block for extruding the sliding cylinder is arranged at the bottom end of the piston rod.

[0019] A plurality of rectangular grooves are arranged in the bottom of the conductive material rod, a plurality of sliding grooves corresponding to the positions of the rectangular grooves are arranged in the outer surface of the sliding cylinder, a plurality of link plates are arranged in each rectangular groove, one end of each link plate is arranged in the sliding groove, and the other end of each link plate is fixedly connected with the inner wall of the counterweight ring.

[0020] The inner part of each chute is slidably provided with a sliding bar, the bottom end of each sliding bar is fixed on an adapter plate, the top end of each sliding bar extends above the sliding cylinder and is jointly fixed with a sliding ring, and the sliding ring is above the push-pull block, the inner wall of the top end of the sliding hole is fixed with a fixed ring, and a spring is fixed between the fixed ring and the sliding ring.

[0021] Compared with the prior art, the vacuum arc furnace for titanium ingot smelting has the following beneficial effects:

[0022] Firstly, the electrically-conductive material rod is provided, in the structure of the electrically-conductive material rod, hydraulic oil is pumped into the hydraulic cavity formed between the piston block and the top end of the sliding hole through the external hydraulic mechanism and the hydraulic pipe, the piston block, the piston rod and the push-pull block move downward together, the push-pull block extrudes the sliding cylinder downward, the top end of the extruding rod extrudes the top end of the clamping rod outward, the bottom end of the clamping rod moves toward the titanium column, the outer surface of the titanium column is extruded and clamped by the tungsten steel chuck, the clamping of the titanium column is completed, the top end of the titanium column is fixed on the bottom end of the electrically-conductive material rod, meanwhile, the plurality of plug-in pieces slide downward under the action of gravity and are tightly clamped between the outer surface of the clamping rod and the bottom of the electrically-conductive material rod to maintain the clamping state of the clamping rod on the top end of the titanium column, then the external hydraulic mechanism stops working to avoid damage of the external hydraulic mechanism due to long-term load, meanwhile, the sliding cylinder moves downward to extrude the compression spring, the compression spring extrudes the sliding rod and the graphite block downward, the bottom surface of the graphite block is tightly attached to the top surface of the titanium column to form a good electrical connection among the electrically-conductive material rod, the graphite block and the titanium column, in addition, during the smelting operation of the titanium column, the bottom end of the electrically-conductive material rod is located in the copper crucible, the environment temperature in the copper crucible is as high as thousands of degrees Celsius, the tin bar is inserted into the smelting hole to melt the tin bar in the smelting hole to reduce the contact resistance between the graphite block and the titanium column, thereby further improving the electrical connection effect of the graphite block and the top end of the titanium column, and the smelting quality of the titanium ingot and the convenience of the smelting operation are improved.

[0023] Secondly, the electrically-conductive material rod is provided, after the smelting operation is completed, a small amount of residual tail material of the titanium column after melting is clamped on the bottom end of the electrically-conductive material rod, in the structure of the electrically-conductive material rod, the hydraulic oil in the hydraulic cavity between the piston block and the top end of the sliding hole is pumped out by the external hydraulic mechanism, the piston block moves upward, the push-pull block pulls the sliding ring, the sliding bar, the adapter plate, the counterweight ring and the plug-in piece to move upward until the plug-in piece is no longer tightly clamped between the outer surface of the clamping rod and the bottom of the electrically-conductive material rod, the clamping rod is movable, the extrusion force of the tungsten steel chuck at the bottom end of the clamping rod on the top end of the titanium column is small, thereby facilitating the removal of the small amount of residual tail material of the titanium column after melting from the bottom end of the electrically-conductive material rod, and the convenience of the smelting operation is further improved.

[0024] Other advantages, objects and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be learned from the practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention from a front view perspective;

[0026] Figure 2 For the present invention Figure 1 A magnified view of the structure at center A;

[0027] Figure 3 It is a three-dimensional structural diagram of the conductive rod in the present invention;

[0028] Figure 4 It is a front cross-sectional view of the conductive rod in the present invention;

[0029] Figure 5 It is a front cross-sectional view of the bottom of the conductive rod in the present invention;

[0030] Figure 6 Schematic diagram of the three-dimensional structure of the bottom of the conductive rod in the present invention Figure 1 ;

[0031] Figure 7 Schematic diagram of the three-dimensional structure of the bottom of the conductive rod in the present invention Figure 2 ;

[0032] Figure 8 This is a three-dimensional diagram of the cross-sectional structure of the conductive rod in the present invention;

[0033] Figure 9 A perspective view of the cross-sectional structure of the bottom of the conductive rod in the present invention;

[0034] Figure 10 This is a disassembled diagram of the internal structure of the conductive rod in the present invention;

[0035] Figure 11 Schematic diagram of the clamping state of the conductive rod on the titanium column in the present invention.

[0036] In the picture:

[0037] 1. External frame; 2. Internal frame; 3. Hydraulic cylinder;

[0038] 4. Conductive rod;

[0039] 41, sliding hole; 4101, limiting groove;

[0040] 42. Slide; 43. Slide rod; 44. Compression spring;

[0041] 45. Graphite block; 451. Tin melting hole;

[0042] 46, hole; 47, counterweight ring; 48, plug; 49, material extraction hole; 410, extrusion rod;

[0043] 411, clamping rod; 4111, tungsten steel chuck;

[0044] 412, rectangular groove; 413, sliding groove; 414, engaging plate; 415, sliding bar; 416, sliding ring; 417, fixed ring; 418, spring; 419, piston block; 420, piston rod; 421, push-pull block; 422, hydraulic pipe;

[0045] 5, sealing cover; 6, table cylinder; 7, pulley; 8, anode power seat; 9, copper crucible; 10, negative pressure pipeline; 11, water cooling sleeve; 12, sealing sleeve; 13, heat insulation block; 14, cleaning ring; 15, titanium column. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] Please refer to Figures 1-11 The present application provides the following implementation: a vacuum arc furnace for titanium ingot smelting and forming, comprising an outer frame 1 arranged on the ground, a middle part of the outer frame 1 is slidingly arranged with an inner frame 2, the inner frame 2, and the outer frame 1 are connected through the arrangement of hydraulic components to provide power, so that the inner frame 2 can slide up and down on the middle part of the outer frame 1, which can be implemented in combination with conventional technology.

[0048] The top of the inner frame 2 is fixed with a hydraulic cylinder 3 through an insulating plate, the bottom of the inner frame 2 is fixed with a sealing cover 5, the telescopic end of the hydraulic cylinder 3 is fixed with a conductive material rod 4, the outer surface of the conductive material rod 4 is electrically connected with the cathode of the smelting power supply, and the bottom end of the conductive material rod 4 extends to the inside of the sealing cover 5.

[0049] A cooling sealing assembly is arranged between the outer surface of the conductive material rod 4 and the top of the sealing cover 5.

[0050] Specifically, the cooling sealing assembly comprises a water cooling sleeve 11 slidingly sleeved on the outer surface of the conductive material rod 4 and a sealing sleeve 12, the sealing sleeve 12 is fixed on the upper surface of the water cooling sleeve 11, and the water cooling sleeve 11 is fixed on the top surface of the sealing cover 5 through the heat insulation block 13. The sliding sealing between the outer surface of the conductive material rod 4 and the sealing cover 5 is realized, and the water cooling sleeve 11 is used to cool the conductive material rod 4, so that the section of the conductive material rod 4 above the sealing cover 5 maintains a reasonable temperature.

[0051] The inside of the sealing sleeve 12 is also provided with a cleaning ring 14, which is slidingly sleeved on the outer surface of the conductive material rod 4. The cleaning ring 14 is used to clean the surface of the conductive material rod 4, so as to ensure the sliding sealing effect between the outer surface of the conductive material rod 4 and the sealing cover 5.

[0052] The device further comprises a table cylinder 6 fixed on the ground, one end of the inner frame 2 is rotatably installed on the top of the table cylinder 6, and the other end of the inner frame 2 is provided with a set of pulleys 7, and the pulleys 7 are driven by a motor.

[0053] The device further comprises an anode contact seat 8 slidingly arranged on the ground and a copper crucible 9 arranged on the ground, wherein the anode contact seat 8 is electrically connected with the anode of the smelting power supply, the anode contact seat 8 is used to seal between the sealing cover 5 and the copper crucible 9, and is used to electrically connect the copper crucible 9 with the anode of the smelting power supply, and the middle part of the sealing cover 5 is further fixedly connected with a negative pressure pipeline 10 for vacuumizing, and the negative pressure pipeline 10 is connected with an external vacuumizing equipment.

[0054] Please refer to Figure 1 and Figure 2In the above scheme, the outer frame 1 can be rotated around the table cylinder 6 by driving the pulley 7 with the motor. Before melting the titanium column 15, the outer frame 1 is first rotated around the table cylinder 6 until the sealing cover 5 is no longer located directly above the copper crucible 9, and then the inner frame 2 is moved upward while the conducting rod 4 is synchronously moved upward by the hydraulic cylinder 3 until it reaches a specified height. Then, the titanium column 15 to be melted is transferred to the position directly below the conducting rod 4, and the top end of the titanium column 15 is fixed to the bottom end of the conducting rod 4, and the conducting rod 4 is in good electrical connection with the titanium column 15. Then, the anode electrode holder 8 is pushed to the position directly above the copper crucible 9, and then the outer frame 1 is reversely rotated around the table cylinder 6 until the sealing cover 5, the conducting rod 4 and the titanium column 15 are all located directly above the copper crucible 9. Then, the inner frame 2, the conducting rod 4 and the sealing cover 5 are synchronously lowered until the bottom end of the sealing cover 5 is pressed against the top surface of the anode electrode holder 8, and the bottom surface of the anode electrode holder 8 is also pressed against the top surface of the copper crucible 9. The copper crucible 9 is electrically connected to the anode of the melting power source through the anode electrode holder 8, and the sealing cover 5, the anode electrode holder 8 and the copper crucible 9 form a sealed cavity. Then, the height of the conducting rod 4 and the titanium column 15 is adjusted by the hydraulic cylinder 3 until a reasonable arc gap is formed between the bottom surface of the titanium column 15 and the inner bottom wall of the copper crucible 9. Then, the air inside the sealing cover 5, the anode electrode holder 8 and the copper crucible 9 is pumped out through the negative pressure pipeline 10. Then, the melting power source is turned on, the titanium column 15 acts as a consumable electrode (cathode), and the copper crucible 9 acts as an anode, so that an electric arc is formed between the bottom surface of the titanium column 15 and the inner bottom wall of the copper crucible 9, and the bottom end of the titanium column 15 is continuously melted. At the same time, the molten titanium drips into the copper crucible 9 cooled by the water cooling mechanism, and solidifies into a titanium ingot with a larger diameter, which is used to process larger size titanium parts. In addition, during the melting process, the titanium column 15 continuously decreases to maintain a reasonable arc gap between the bottom end of the titanium column 15 and the molten titanium.

[0055] The above scheme and principle are the existing technical scheme and principle of the vacuum arc furnace, and can be implemented by using conventional existing technology in combination with the related implementation spirit and implementation purpose.

[0056] Please refer to Figures 3-11 The conducting rod 4 is electrically connected to the cathode of the melting power source and can hold the titanium column 15 at the bottom. The titanium column 15 acts as a consumable electrode and forms an electric circuit with the conducting rod 4, the cathode of the melting power source, the anode of the melting power source and the copper crucible 9 during the melting operation.

[0057] The middle part of the conductive material rod 4 is provided with a sliding hole 41 which extends to the bottom end surface of the conductive material rod 4. A sliding cylinder 42 is slidably arranged in the sliding hole 41. A sliding rod 43 is slidably arranged in the sliding cylinder 42. A compression spring 44 is fixed between the top end of the sliding rod 43 and the inner top wall of the sliding cylinder 42. A limiting groove 4101 is formed in the inner wall of the bottom end of the sliding hole 41. A graphite block 45 is slidably arranged in the inner wall of the bottom end of the sliding hole 41. A plurality of molten tin insertion holes 451 are formed in the bottom surface of the graphite block 45. The bottom end of the sliding rod 43 extends below the sliding cylinder 42, is slidably connected in the limiting groove 4101 and is fixedly installed on the graphite block 45.

[0058] The sliding hole 41, the sliding cylinder 42 and the sliding rod 43 are provided with sliding keys and sliding key grooves to avoid mutual rotation.

[0059] The bottom end of the conductive material rod 4 is provided with a plurality of strip holes 46 which are circumferentially arranged about the axis. A counterweight ring 47 is slidably sleeved on the outer surface of the bottom end of the conductive material rod 4. A plurality of plug-in pieces 48 are fixed to the bottom end of the counterweight ring 47 and correspond to the positions of the strip holes 46. A material extraction hole 49 is formed in the middle part of each plug-in piece 48 and corresponds to the position of the strip hole 46. An extrusion rod 410 is slidably arranged in each strip hole 46. One end of each of the plurality of extrusion rods 410 is hingedly connected to the bottom end of the sliding cylinder 42. The other end of each of the plurality of extrusion rods 410 penetrates the material extraction hole 49 and is hingedly connected with a clamping rod 411. The middle part of the clamping rod 411 is hingedly connected to the outer surface of the bottom end of the conductive material rod 4. The top end of the clamping rod 411 is inclined toward one side surface of the conductive material rod 4. A tungsten clamp head 4111 is fixed to the bottom end of the clamping rod 411.

[0060] A piston block 419 is slidably arranged at the top of the sliding hole 41. A hydraulic chamber is formed between the piston block 419 and the top end of the sliding hole 41. The hydraulic chamber is connected with an external hydraulic mechanism through a hydraulic pipe 422. A piston rod 420 is fixed to the bottom end of the piston block 419. A push-pull block 421 is fixed to the bottom end of the piston rod 420 and is used to extrude the sliding cylinder 42.

[0061] The above scheme is the specific structure of the conductive material rod 4, which is mainly used for clamping and fixing the titanium column 15 and forming a good electrical connection relationship between the titanium column 15 and the conductive material rod 4. The specific principle is as follows:

[0062] First, the tin bar is inserted into the tin melting hole 451, and then the top end surface of the titanium column 15 is polished smooth, and is vertically arranged below the conductive material rod 4. The conductive material rod 4 is moved downward by the hydraulic cylinder 3 until the bottom end surface of the conductive material rod 4 is pressed against the top end of the titanium column 15. Then, hydraulic oil is pumped into the hydraulic cavity formed between the piston block 419 and the top end of the sliding hole 41 through the external hydraulic mechanism and the hydraulic pipe 422, so that the piston block 419, the piston rod 420 and the push-pull block 421 move downward together. The push-pull block 421 extrudes the sliding cylinder 42 downward, and the extrusion rod 410 extrudes the top end of the clamping rod 411 outward, so that the bottom end of the plurality of clamping rods 411 moves towards the titanium column 15, and the tungsten steel chuck 4111 extrudes and clamps the outer surface of the titanium column 15, completing the clamping of the titanium column 15, so that the top end of the titanium column 15 is fixed to the bottom end of the conductive material rod 4. At the same time, the plurality of plug-in sheets 48 slide downward under the action of gravity and are tightly clamped between the clamping rod 411 and the outer surface of the bottom of the conductive material rod 4, so as to maintain the clamping state of the clamping rod 411 to the top end of the titanium column 15. Then, the external hydraulic mechanism can be stopped to avoid damage to the external hydraulic mechanism due to long-term load. At the same time, the downward movement of the sliding cylinder 42 extrudes the compression spring 44, and the compression spring 44 extrudes the sliding rod 43 and the graphite block 45 downward, so that the bottom surface of the graphite block 45 tightly contacts the top end surface of the titanium column 15, and good electrical connection is formed between the conductive material rod 4, the graphite block 45 and the titanium column 15. In addition, during the melting operation of the titanium column 15, the bottom end of the conductive material rod 4 is located in the copper crucible 9, and the environmental temperature in the copper crucible 9 is as high as thousands of degrees Celsius, which can melt the tin bar in the tin melting hole 451 to reduce the contact resistance between the graphite block 45 and the titanium column 15, thereby further improving the electrical connection effect between the graphite block 45 and the top end of the titanium column 15. In summary, the melting quality of the titanium ingot and the convenience of the melting operation can be improved.

[0063] It should be noted that in the above scheme, the top end of the sliding rod 43 extends to the top of the sliding cylinder 42, and the compression spring 44 is arranged between the top end and the inner top wall of the sliding cylinder 42, in order to avoid the compression spring 44 losing elasticity due to the high temperature at the bottom end of the conductive material rod 4. Mainly because, according to the current material technology, the heat resistance temperature of the compression spring 44 is only about six or seven hundred degrees Celsius, which cannot meet the use requirement under high temperature.

[0064] In addition, the material of the tungsten steel chuck 4111 is YG6 tungsten steel, and the Rockwell hardness is about 90HR, which is much higher than the Rockwell hardness of pure titanium and conventional titanium alloy. Therefore, under a certain clamping pressure, it can be slightly cut into the titanium column 15 to ensure the clamping effect of the titanium column 15.

[0065] In addition, the melting point of the graphite block 45 made of graphite is above 3000 degrees Celsius, the graphite block 45 has high electrical conductivity and low hardness, can form sliding contact with the sliding hole 41 to have low resistivity, and can form good contact with the top surface of the titanium column 15 under pressure, so that good electrical connection can be formed between the top surface of the titanium column 15 and the graphite block 45. In addition, the tin strip can improve the electrical contact surface between the top surface of the titanium column 15 and the graphite block 45 after melting, and will not be welded in the tin melting hole 451. In addition, the tin paddle after melting will not flow out from the fine gap between the graphite block 45 and the top surface of the copper crucible 9 under the action of molecular tension.

[0066] Please refer to Figure 4 , Figure 5 , Figure 9 and Figure 10 , the bottom of the conductive material rod 4 is provided with a plurality of rectangular grooves 412, and the rectangular grooves 412 are located above the strip holes 46. The outer surface of the sliding cylinder 42 is provided with a plurality of sliding grooves 413 corresponding to the positions of the rectangular grooves 412. The inside of each rectangular groove 412 is slidably provided with an adapter plate 414. The ends of the plurality of adapter plates 414 close to each other are slidably arranged in the inside of the sliding grooves 413, and the ends of the plurality of adapter plates 414 away from each other are fixedly connected with the inner wall of the counterweight ring 47.

[0067] The inside of each sliding groove 413 is slidably provided with a sliding bar 415. The bottom ends of the plurality of sliding bars 415 are fixed on the plurality of adapter plates 414. The top ends of the plurality of sliding bars 415 extend above the sliding cylinder 42 and are commonly fixed with a sliding ring 416. The sliding ring 416 is located above the push-pull block 421. The inner wall of the top end of the sliding hole 41 is fixed with a fixed ring 417. The fixed ring 417 and the sliding ring 416 are fixed with a spring 418. The spring 418 provides a downward movement pressure to the sliding ring 416, the sliding bar 415, the counterweight ring 47 and the plug-in sheet 48, which is beneficial to the bottom end of the plug-in sheet 48 being clamped between the clamp rod 411 and the outer surface of the bottom of the conductive material rod 4.

[0068] In combination with the above technical solutions, when the smelting operation is completed, a small amount of residual tailings of the titanium column 15 after melting will be clamped at the bottom end of the conductive material rod 4. At this time, the hydraulic oil in the hydraulic cavity formed between the piston block 419 and the top end of the sliding hole 41 is extracted by the external hydraulic mechanism, so that the piston block 419 moves upward, the push-pull block 421 pulls the sliding ring 416, the sliding bar 415, the adapter plate 414, the counterweight ring 47 and the plug-in sheet 48 to move upward, until the plug-in sheet 48 is no longer tightly clamped between the clamp rod 411 and the outer surface of the bottom of the conductive material rod 4, and the clamp rod 411 is in a movable state. At this time, the tungsten clamp head 4111 at the bottom end of the clamp rod 411 has small extrusion force on the top end of the titanium column 15, so that the small amount of residual tailings of the titanium column 15 after melting can be taken out from the bottom end of the conductive material rod 4, and the next feeding operation can be quickly performed.

[0069] The working principle has been shown in order above, it needs to be explained that the auxiliary scheme and related supporting technology required by the present application can be implemented by using conventional technology according to the implementation spirit and implementation purpose of the present application.

[0070] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A vacuum arc furnace for melting and forming titanium ingots, comprising an outer frame (1) arranged on the ground, an inner frame (2) slidably arranged in the middle of the outer frame (1), a hydraulic cylinder (3) fixed to the top of the inner frame (2) through an insulating plate, and a sealing cover (5) fixed to the bottom of the inner frame (2), characterized in that: A conductive rod (4) is fixed to the telescopic end of the hydraulic cylinder (3), and the bottom end of the conductive rod (4) extends to the interior of the sealing cover (5); The conductive rod (4) serves as a conductive rod and is electrically connected to the cathode of the smelting power supply, and the bottom of the conductive rod (4) can clamp the titanium column. A sliding hole (41) is provided in the middle of the conductive rod (4), a sliding cylinder (42) is provided inside the sliding hole (41), a sliding rod (43) is provided inside the sliding cylinder (42), a compression spring (44) is fixed between the top of the sliding rod (43) and the inner top wall of the sliding cylinder (42), a limiting groove (4101) is provided on the inner wall of the bottom end of the sliding hole (41), a graphite block (45) is provided on the inner wall of the bottom end of the sliding hole (41), and a plurality of tin-melting holes (451) for inserting tin bars are provided on the bottom surface of the graphite block (45), and the bottom end of the sliding rod (43) extends to the bottom of the sliding cylinder (42) and is slidably engaged in the limiting groove (4101) and is fixedly mounted on the graphite block (45); The bottom end of the conductive rod (4) is provided with a plurality of strip holes (46) arranged in a circular array about its axis. A weight ring (47) is slidably sleeved on the outer surface of the bottom end of the conductive rod (4). A plurality of plugging pieces (48) corresponding to the positions of the strip holes (46) are fixed to the bottom end of the weight ring (47). A material removal hole (49) corresponding to the position of the strip holes (46) is provided in the middle of the plugging piece (48). An extrusion rod is slidably provided inside each of the strip holes (46). (410), the ends of the multiple extrusion rods (410) that are close to each other are hinged to the bottom end of the slide (42), and the ends of the multiple extrusion rods (410) that are away from each other pass through the material removal hole (49) and are hinged to the clamping rod (411), the middle part of the clamping rod (411) is hinged to the outer surface of the bottom end of the conductive material rod (4), the top end of the clamping rod (411) close to the conductive material rod (4) is a sloped side, and the bottom end of the clamping rod (411) is fixed with a tungsten steel clamp (4111); A piston block (419) is slidably provided at the top of the sliding hole (41), and a hydraulic chamber is formed between the piston block (419) and the top of the sliding hole (41). The hydraulic chamber is connected to an external hydraulic mechanism through a hydraulic pipe (422). A piston rod (420) is fixed to the bottom end of the piston block (419), and a push-pull block (421) for squeezing the sliding cylinder (42) is fixed to the bottom end of the piston rod (420).

2. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: The bottom of the conductive rod (4) is provided with a plurality of rectangular grooves (412), the outer surface of the slide cylinder (42) is provided with a plurality of slide grooves (413) corresponding to the positions of the rectangular grooves (412), and a connecting plate (414) is slidably provided inside each of the rectangular grooves (412), and the ends of the connecting plates (414) close to each other are respectively slidably provided inside the slide grooves (413), and the ends of the connecting plates (414) away from each other are fixedly connected to the inner wall of the counterweight ring (47); A slide bar (415) is slidably provided inside each of the slide grooves (413), and the bottom ends of the plurality of slide bars (415) are respectively fixed on a plurality of connecting plates (414), and the top ends of the plurality of slide bars (415) extend to the top of the slide cylinder (42) and are fixed with a slip ring (416) together, and the slip ring (416) is located above the push-pull block (421), and a fixing ring (417) is fixed to the inner wall of the top end of the slide hole (41), and a spring (418) is fixed between the fixing ring (417) and the slip ring (416).

3. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: A cooling sealing assembly is provided between the outer surface of the conductive rod (4) and the top of the sealing cover (5), and the cooling sealing assembly comprises a water-cooling sleeve (11) and a sealing sleeve (12) which are slidably sleeved on the outer surface of the conductive rod (4), the sealing sleeve (12) being fixed on the upper surface of the water-cooling sleeve (11), and the water-cooling sleeve (11) being fixed on the top surface of the sealing cover (5) via a heat-insulating block (13).

4. The vacuum arc furnace for melting and forming titanium ingots according to claim 3, characterized in that: A cleaning ring (14) is also installed inside the sealing sleeve (12), and the cleaning ring (14) is slidably sleeved on the outer surface of the conductive rod (4).

5. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: It also includes a table cylinder (6) fixed on the ground, one end of the inner frame (2) is rotatably mounted on the top of the table cylinder (6), and the other end of the inner frame (2) is mounted with a group of pulleys (7), and the pulleys (7) are driven by a motor.

6. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: The invention also includes an anode connection seat (8) slidably arranged on the ground and a copper crucible (9) arranged under the ground. The anode connection seat (8) is used to seal between the sealing cover (5) and the copper crucible (9), and to electrically connect the copper crucible (9) to the anode of the smelting power supply. The middle part of the sealing cover (5) is also fixedly connected to a negative pressure pipe (10) for vacuuming.

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