A vacuum arc furnace for melting and forming titanium ingots

Abstract

The invention discloses a vacuum arc furnace for melting and forming titanium ingots, which belongs to the technical field of titanium ingot melting, and comprises a frame and a vacuum chamber vertically slidably mounted on the outside of the frame. The invention is provided with a mounting seat fixed at the bottom end of a material rod, and an upper ball is rotatably mounted inside the mounting seat through a spherical cover, and a lower ball is rotatably mounted on the top of a clamping seat, a connecting rod is fixed between the upper ball and the lower ball, and the mounting seat and the clamping seat are in a movable connection state. When the vacuum chamber moves downward to fix the electrode, even if there is a deviation between the T-shaped plug rod and the center of the slot, after the T-shaped plug rod enters the inside of the slot, the position of the clamping seat can be self-adjusted, so as to facilitate clamping and fixing the electrode. In the process of lifting the electrode, the upper ball can automatically rotate under the action of the electrode's own gravity to adjust the electrode vertically, and then a limiting mechanism is used to stably limit the mounting seat and the clamping seat, so that the coaxial adjustment of the electrode and the crystallizer is more convenient.

Description

Technical Field

[0001] The invention relates to a vacuum arc furnace, in particular to a vacuum arc furnace for melting and forming titanium ingots, belonging to the technical field of titanium ingot melting. Background Art

[0002] The vacuum consumable arc furnace works in a high vacuum environment, which can effectively prevent titanium from reacting with oxygen, nitrogen and other gases in the air, ensuring the purity and quality of titanium ingots. The equipment uses consumable electrodes as the raw materials to be smelted. The electrodes gradually melt under the high temperature generated by the arc, and the molten droplets fall into the water-cooled copper crystallizer to form a molten pool. Under the forced cooling of the crystallizer, the molten metal in the molten pool solidifies sequentially from the bottom to the top, and finally forms a titanium ingot. During the smelting process, in order to ensure the stability of the arc and the uniformity of the molten pool, the position of the electrode needs to be adjusted to make the electrode coaxial with the crystallizer.

[0003] At present, in the process of adjusting the electrode position, the vacuum chamber is first moved to the top of the electrode, and then the position of the clamp is fine-tuned to ensure that the clamp is located vertically above the electrode. The electrode is then clamped and positioned using the clamp, and then the lifting device is used to control the electrode to move up to a certain height, and the bottom end of the electrode is separated from the crucible. The electrode is then moved on the XY axis by two sets of hydraulic cylinders on the top of the frame, and optical instruments are used for detection. Finally, smelting is carried out after the adjustment is completed. The entire adjustment process requires multiple electrical equipment for regulation, which not only requires a complex control system, but also makes the adjustment and control inconvenient.

[0004] Therefore, a vacuum arc furnace for melting and forming titanium ingots is designed to optimize the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a vacuum arc furnace for melting and forming titanium ingots, wherein a mounting seat is fixedly provided at the bottom end of the material rod, and an upper ball is rotatably installed inside the mounting seat through a spherical cover, and a lower ball is rotatably installed on the top of the clamping seat, and a connecting rod is fixed between the upper ball and the lower ball, and the mounting seat and the clamping seat are in a movable connection state. When the vacuum chamber moves downward to fix the electrode, even if there is a deviation between the T-shaped rod and the center of the slot, when the T-shaped rod enters the inside of the slot, the position of the clamping seat can be self-adjusted to facilitate clamping and fixing the electrode. In the process of lifting the electrode, the upper ball can automatically rotate under the action of the electrode's own gravity to vertically adjust the electrode, and then the limiting mechanism is used to stably limit the mounting seat and the clamping seat, so that the electrode and the crystallizer can be coaxially adjusted. It is more convenient. Through the fixing mechanism composed of the slide groove, trapezoidal plug, second spring, gear, first rack, second rack, connecting ring and fixing ring, the electrode can be automatically fixed after the T-shaped plug rod is inserted into the slot. After the electrode is smelted, the positioning state of the T-shaped plug rod can be released by controlling the upward movement of the clamp seat, which is convenient for replacing the electrode. It is more practical. Through the limiting mechanism composed of the groove, mounting groove, pull rod, plate, first spring, first hydraulic chamber, first piston, first piston rod, second hydraulic chamber, second piston, second piston rod and annular groove, the electrode can be automatically adjusted vertically by using the gravity transmission of the electrode itself to control the limiting mechanism to fix the position between the mounting seat and the clamp seat, which not only speeds up the vertical adjustment rate of the electrode but also makes it more convenient to use.

[0006] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0007] A vacuum arc furnace for melting and forming titanium ingots comprises a frame, a vacuum chamber vertically slidably mounted on the outside of the frame, a lifting device mounted on the frame for controlling the lifting of the vacuum chamber, a water jacket located below the vacuum chamber, and a crucible mounted inside the water jacket, a material rod vertically slidably mounted on the inner top of the vacuum chamber, the top of the material rod is connected to the lifting device, a mounting seat is fixed to the bottom end of the material rod, a spherical cover is mounted inside the mounting seat, an upper ball is rotatably mounted inside the spherical cover, a connecting rod is vertically mounted on the outside of the upper ball, a lower ball is fixed to the bottom end of the connecting rod, a clamping seat is arranged below the mounting seat, the lower ball is rotatably mounted inside the clamping seat, a slot is provided at the middle position of the bottom of the clamping seat, a trumpet-shaped opening is provided at the bottom end of the slot, a T-shaped plug is fixed to the top of the electrode inside the crucible, and a fixing mechanism for positioning the T-shaped plug is provided inside the slot.

[0008] Preferably, an arc-shaped groove is provided at the middle position of the top of the clamp seat, the lower ball is located inside the arc-shaped groove, and a funnel-shaped opening is provided at the top of the arc-shaped groove.

[0009] Preferably, the top end of the T-shaped rod is in an arc shape, and the inner top shape of the slot is the same as that of the T-shaped rod.

[0010] Preferably, the diameter of the opening at the bottom of the slot is larger than half of the inner diameter of the vacuum chamber, and the inner side of the slot is coated with a wear-resistant coating.

[0011] Preferably: the fixing mechanism includes a slide groove, a trapezoidal plug, a second spring and a pulling assembly, the slide grooves are evenly arranged on the inner side of the slot in a circular array, trapezoidal plugs are slidably arranged inside the slide grooves, a second spring is arranged between the trapezoidal plug and the inner end of the slide groove, and a pulling assembly for controlling the trapezoidal plug to move toward the inside of the slide groove is arranged inside the clamp seat.

[0012] Preferably: the pulling assembly includes a gear, a first rack, a second rack and a fixed ring, the gear is rotatably installed on the outer side of the end of the slide groove, the top of the gear is meshed with the first rack, the first rack is slidably installed inside the clamp seat and fixedly connected to the end of the trapezoidal plug block, the outer side of the gear is vertically meshed with the second rack, the second rack is slidably connected to the clamp seat and extends to the top of the clamp seat, the inner wall of the vacuum chamber is horizontally fixed with a fixed ring, the inner diameter of the fixed ring is larger than the outer diameter of the mounting seat, and the fixed ring is located vertically above the second rack.

[0013] Preferably: a connecting ring is fixed between the top ends of the second racks, and the connecting ring is parallel to the top of the clamping seat.

[0014] Preferably: the limiting mechanism comprises a groove, a mounting groove, a pull rod, a plate, a first spring, a first hydraulic chamber, a first piston, a first piston rod, a second hydraulic chamber, a second piston and a second piston rod, the groove is opened at the middle position of the bottom end of the mounting seat, the spherical cover is vertically slidably arranged inside the groove, the top of the groove is opened with a mounting groove, the top of the spherical cover is vertically fixed with a pull rod, and the top of the pull rod is located inside the mounting groove, the top of the pull rod is horizontally fixed with a plate, the bottom of the plate and the inner bottom end of the mounting groove are provided with a first spring, the bottom end of the mounting groove is evenly opened with a first hydraulic chamber, the inside of the first hydraulic chamber is vertically slidably provided with a first piston, the top of the first piston and the bottom of the plate are fixed with a first piston rod, the outer side of the bottom end of the mounting seat is evenly opened with a second hydraulic chamber, the number of the second hydraulic chambers is the same as the number of the first hydraulic chambers, the top ends of the second hydraulic chambers are respectively connected with the bottom ends of the first hydraulic chambers, the inner top ends of the second hydraulic chambers are slidably provided with a second piston, and the bottom end of the second piston is fixed with a second piston rod.

[0015] Preferably, four groups of second piston rods are provided, and the second piston rods are distributed in a ring array at the bottom of the mounting seat.

[0016] Preferably, an annular groove is provided on the top of the clamping seat, the annular groove is located directly below the second piston rod, and an anti-slip groove is provided on the bottom end of the second piston rod.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides a vacuum arc furnace for melting and forming titanium ingots. The mounting seat is fixedly provided at the bottom end of the material rod, and an upper ball is rotatably installed inside the mounting seat through a spherical cover, and a lower ball is rotatably installed on the top of the clamping seat. A connecting rod is fixed between the upper ball and the lower ball, and the mounting seat and the clamping seat are in a movable connection state. When the vacuum chamber moves downward to fix the electrode, even if there is a deviation between the T-shaped plug rod and the center of the slot, after the T-shaped plug rod enters the inside of the slot, the position of the clamping seat can be self-adjusted to facilitate clamping and fixing the electrode. In the process of lifting the electrode, the upper ball can automatically rotate under the action of the electrode's own gravity to adjust the electrode vertically, and then the mounting seat and the clamping seat are stably limited by a limiting mechanism, so that the coaxial adjustment of the electrode and the crystallizer is more convenient.

[0019] The fixing mechanism composed of the slide groove, the trapezoidal plug block, the second spring, the gear, the first rack, the second rack, the connecting ring and the fixing ring can automatically fix the electrode after the T-shaped plug rod is inserted into the slot. After the electrode is smelted, the positioning state of the T-shaped plug rod can be released by controlling the upward movement of the clamp seat, so that the electrode can be replaced conveniently, which is more practical.

[0020] Through the limiting mechanism composed of the groove, the mounting groove, the pull rod, the flat plate, the first spring, the first hydraulic chamber, the first piston, the first piston rod, the second hydraulic chamber, the second piston, the second piston rod and the annular groove, the electrode can be automatically adjusted vertically by utilizing the gravity transmission of the electrode itself to control the limiting mechanism and fix the position between the mounting seat and the clamping seat, which not only speeds up the vertical adjustment rate of the electrode but also makes it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0022] Figure 2 This is a diagram showing the initial state of the interior of a vacuum chamber of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0023] Figure 3 This is a diagram showing the clamping state of electrodes inside a vacuum chamber of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0024] Figure 4 This is a diagram of the vertical melting state of the electrodes inside the vacuum chamber of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0025] Figure 5This is a diagram showing a T-shaped rod removed from a vacuum chamber in a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0026] Figure 6 It is a cross-sectional view of a mounting seat of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0027] Figure 7 It is a cross-sectional view of a clamping seat of a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots of the present invention;

[0028] Figure 8 This is a diagram of the installation position of a fixing ring in a preferred embodiment of a vacuum arc furnace for melting and forming titanium ingots according to the present invention.

[0029] In the figure: 1, frame; 2, vacuum chamber; 3, lifting device; 4, water jacket; 5, crucible; 6, material rod; 7, mounting seat; 8, spherical cover; 9, upper ball; 10, connecting rod; 11, clamping seat;

[0030] 12. lower ball; 1201. arc groove;

[0031] 13. Limiting mechanism; 1301. Groove; 1302. Mounting groove; 1303. Pull rod; 1304. Plate; 1305. First spring; 1306. First hydraulic chamber; 1307. First piston; 1308. First piston rod; 1309. Second hydraulic chamber; 1310. Second piston; 1311. Second piston rod; 1312. Annular groove;

[0032] 14. slot; 15. T-shaped plug;

[0033] 16. Fixing mechanism; 1601. Slide groove; 1602. Trapezoidal plug block; 1603. Second spring; 1604. Gear; 1605. First rack; 1606. Second rack; 1607. Connecting ring; 1608. Fixing ring. DETAILED DESCRIPTION

[0034] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0035] like Figure 1-Figure 8As shown, this embodiment provides a vacuum arc furnace for melting and forming titanium ingots, comprising a frame 1, a vacuum chamber 2 vertically slidably mounted on the outside of the frame 1, a lifting device 3 mounted on the frame 1 to control the lifting of the vacuum chamber 2, a water jacket 4 located below the vacuum chamber 2, and a crucible 5 mounted inside the water jacket 4, a material rod 6 is vertically slidably mounted on the inner top of the vacuum chamber 2, the top of the material rod 6 is connected to the lifting device 3, a mounting seat 7 is fixed to the bottom of the material rod 6, a spherical cover 8 is mounted inside the mounting seat 7, An upper ball 9 is rotatably mounted inside the spherical cover 8, a connecting rod 10 is vertically mounted on the outer side of the upper ball 9, a lower ball 12 is fixed to the bottom end of the connecting rod 10, a clamping seat 11 is provided below the mounting seat 7, the lower ball 12 is rotatably mounted inside the clamping seat 11, a slot 14 is provided at the middle position of the bottom of the clamping seat 11, a trumpet-shaped opening is provided at the bottom end of the slot 14, a T-shaped rod 15 is fixed to the top of the electrode inside the crucible 5, and a fixing mechanism 16 for positioning the T-shaped rod 15 is provided inside the slot 14.

[0036] The general working principle is as follows: before fixing the electrode, the electrode is hoisted to the inside of the crucible 5 by means of a hoisting device, and the electrode is vertically fixed inside the crucible 5, and at the same time, the T-shaped rod 15 is fixed to the top of the electrode. Then, the frame 1 is used to first control the vacuum chamber 2 to rotate to the top of the crucible 5, and then the lifting device 3 is used to first control the downward movement of the vacuum chamber 2. After the electrode enters the inside of the vacuum chamber 2, the lifting device 3 is used to control the material rod 6 to move downward. Since the position of the electrode will have a certain offset and is not coaxial with the crystallizer, when the material rod 6 moves downward, the T-shaped rod 15 will not be directly opposite to the middle position of the slot 14. The T-shaped rod 15 first contacts the open opening at the bottom of the slot 14. Since the upper ball 9 and the lower ball 1 2, the clamping seat 11 will automatically adjust its position during the downward movement to ensure that the T-shaped rod 15 is inserted into the center position of the slot 14. After the T-shaped rod 15 is inserted, the position of the T-shaped rod 15 is fixed by the fixing mechanism 16, and then the electrode is controlled to move up a certain height by the lifting device 3. After the bottom of the electrode is separated from the bottom end of the crucible 5, the electrode can rotate with the upper ball 9. The electrode is adjusted vertically under the action of its own gravity, and then the position of the mounting seat 7 and the clamping seat 11 is positioned by the limiting mechanism 13, and the mounting seat 7 and the clamping seat 11 are connected as a whole. The electrode position is fixed, and the position adjustment is completed, coaxial with the crystallizer, and then the electrode is controlled to move down for smelting.

[0037] In this embodiment, an arc-shaped groove 1201 is provided at the middle position of the top of the clamping seat 11 , the lower ball 12 is located inside the arc-shaped groove 1201 , and a funnel-shaped opening is provided at the top of the arc-shaped groove 1201 .

[0038] Partial working principle: The funnel-shaped design at the top of the arc groove 1201 can increase the rotation angle of the lower ball 12.

[0039] In this embodiment, the top end of the T-shaped rod 15 is in an arc shape, and the inner top shape of the slot 14 is the same as the shape of the T-shaped rod 15 .

[0040] Partial working principle: The T-shaped rod 15 can fit tightly with the slot 14, ensuring the installation stability of the electrode.

[0041] In this embodiment, the diameter of the bottom opening of the slot 14 is larger than half of the inner diameter of the vacuum chamber 2 , and the inner side of the slot 14 is coated with a wear-resistant coating.

[0042] Partial working principle: The bottom end of the slot 14 has a large opening, which can easily clamp and fix electrodes of different diameters.

[0043] In this embodiment, the fixing mechanism 16 includes a slide groove 1601, a trapezoidal plug 1602, a second spring 1603 and a pulling component. The slide groove 1601 is evenly arranged on the inner side of the slot 14 in a circular array. Trapezoidal plugs 1602 are slidably arranged inside the slide groove 1601. A second spring 1603 is arranged between the trapezoidal plug 1602 and the inner end of the slide groove 1601. A pulling component for controlling the trapezoidal plug 1602 to move toward the inside of the slide groove 1601 is arranged inside the clamp seat 11.

[0044] Local working principle: During the downward movement of the clamp seat 11, when the T-shaped rod 15 slides along the side of the slot 14 and enters the middle position of the slot 14, the T-shaped rod 15 will first contact the beveled edge of the bottom of the trapezoidal plug 1602, squeezing the trapezoidal plug 1602 toward the inside of the slide groove 1601. When the T-shaped rod 15 is fully inserted into the middle position of the slot 14, the trapezoidal plug 1602 is reset under the elastic force of the second spring 1603, and fits against the bottom of the T-shaped rod 15, thereby stabilizing the position of the T-shaped rod 15.

[0045] In this embodiment, the pulling assembly includes a gear 1604, a first rack 1605, a second rack 1606 and a fixed ring 1608. The gear 1604 is rotatably installed on the outer side of the end of the slide groove 1601, and the top of the gear 1604 is meshed with the first rack 1605. The first rack 1605 is slidably installed inside the clamp seat 11 and fixedly connected to the end of the trapezoidal plug block 1602. The outer side of the gear 1604 is vertically meshed with the second rack 1606. The second rack 1606 is slidably connected to the clamp seat 11 and extends to the top of the clamp seat 11. A fixed ring 1608 is horizontally fixed to the inner wall of the vacuum chamber 2. The inner diameter of the fixed ring 1608 is larger than the outer diameter of the mounting seat 7, and the fixed ring 1608 is located vertically above the second rack 1606.

[0046] Local working principle: when the positioning state of the T-shaped plug 15 needs to be released after the electrode smelting is completed, the lifting device 3 is used to control the clamp seat 11 to move vertically upward, and the second rack 1606 first contacts the fixed ring 1608. As the clamp seat 11 continues to move upward, the second rack 1606 moves downward to control the rotation of the gear 1604. The first rack 1605 drives the trapezoidal plug block 1602 to move toward the inside of the slide groove 1601, and the trapezoidal plug block 1602 is separated from the T-shaped plug 15, and the T-shaped plug 15 automatically falls.

[0047] In this embodiment, a connecting ring 1607 is fixed between the top ends of the second racks 1606 , and the connecting ring 1607 is parallel to the top of the clamping seat 11 .

[0048] Partial working principle: The use of the connecting ring 1607 can ensure that multiple groups of trapezoidal plug blocks 1602 can be extended and retracted synchronously.

[0049] In this embodiment, the limiting mechanism 13 includes a groove 1301, a mounting groove 1302, a pull rod 1303, a plate 1304, a first spring 1305, a first hydraulic chamber 1306, a first piston 1307, a first piston rod 1308, a second hydraulic chamber 1309, a second piston 1310 and a second piston rod 1311. The groove 1301 is provided at the middle position of the bottom end of the mounting seat 7. The spherical cover 8 is vertically slidably arranged inside the groove 1301. The top of the groove 1301 is provided with a mounting groove 1302. The top of the spherical cover 8 is vertically fixed with a pull rod 1303, and the top of the pull rod 1303 is located inside the mounting groove 1302. The top of the pull rod 1303 is horizontally fixed with a plate 1304, and the bottom of the plate 1304 is aligned with the mounting groove 1302. A first spring 1305 is provided at the inner bottom end of the mounting groove 1302, and a first hydraulic chamber 1306 is evenly opened at the bottom end of the mounting groove 1302. A first piston 1307 is vertically slidably arranged inside the first hydraulic chamber 1306, and a first piston rod 1308 is fixed between the top of the first piston 1307 and the bottom of the flat plate 1304. Second hydraulic chambers 1309 are evenly opened on the outer side of the bottom end of the mounting seat 7. The number of the second hydraulic chambers 1309 is the same as that of the first hydraulic chambers 1306, and the tops of the second hydraulic chambers 1309 are respectively connected to the bottoms of the first hydraulic chambers 1306, and second pistons 1310 are slidably arranged on the inner tops of the second hydraulic chambers 1309, and second piston rods 1311 are fixed to the bottoms of the second pistons 1310.

[0050] Local working principle: in the initial state, the top of the plate 1304 fits with the inner top of the mounting groove 1302. After the clamp seat 11 is fixed to the electrode, as the electrode moves upward, the downward pulling force on the bottom end of the pull rod 1303 will increase, and the plate 1304 will move downward, and the hydraulic oil inside the first hydraulic chamber 1306 will be squeezed into the second hydraulic chamber 1309 through the first piston 1307, and then the second piston rod 1311 will be controlled to slide vertically downward. The downward movement of the second piston rod 1311 squeezes the top of the clamp seat 11, which can quickly complete the vertical adjustment of the electrode, and squeeze and position the clamp seat 11, connect the mounting seat 7 and the clamp seat 11 as a whole, and ensure the verticality and stability of the electrode. When the electrode is smelted and the T-shaped rod 15 is removed from the clamp seat 11, the pulling force at the bottom end of the pull rod 1303 returns to the initial state, and the first spring 1305 controls the resetting of the second piston rod 1311 to release the positioning state of the clamp seat 11.

[0051] In this embodiment, four groups of second piston rods 1311 are provided, and the second piston rods 1311 are distributed in a ring array at the bottom of the mounting seat 7 .

[0052] Partial working principle: By disposing multiple groups of second piston rods 1311, the stability of the clamping seat 11 can be ensured.

[0053] In this embodiment, an annular groove 1312 is formed on the top of the clamping seat 11 . The annular groove 1312 is located directly below the second piston rod 1311 . The bottom end of the second piston rod 1311 is provided with anti-slip grooves.

[0054] Partial working principle: the opening of the annular groove 1312 can limit the position of the second piston rod 1311 , thereby ensuring the stability between the mounting seat 7 and the clamping seat 11 .

[0055] The above description is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which belong to the protection scope of the present invention.

Claims

1. A vacuum arc furnace for melting and forming titanium ingots, comprising a frame (1), a vacuum chamber (2) vertically slidably mounted on the outside of the frame (1), a lifting device (3) mounted on the frame (1) to control the lifting of the vacuum chamber (2), a water jacket (4) located below the vacuum chamber (2), and a crucible (5) mounted inside the water jacket (4), characterized in that: A material rod (6) is vertically slidably mounted on the inner top of the vacuum chamber (2), the top of the material rod (6) is connected to the lifting device (3), a mounting seat (7) is fixed to the bottom of the material rod (6), a spherical cover (8) is mounted inside the mounting seat (7), an upper ball (9) is rotatably mounted inside the spherical cover (8), a connecting rod (10) is vertically mounted on the outer side of the upper ball (9), a lower ball (12) is fixed to the bottom end of the connecting rod (10), a clamping seat (11) is arranged below the mounting seat (7), the lower ball (12) is rotatably mounted inside the clamping seat (11), a slot (14) is provided at the middle position of the bottom of the clamping seat (11), a trumpet-shaped opening is provided at the bottom end of the slot (14), a T-shaped plug rod (15) is fixed to the top of the electrode inside the crucible (5), and a fixing mechanism (16) for positioning the T-shaped plug rod (15) is provided inside the slot (14); The vacuum arc furnace also includes a limiting mechanism (13), which includes a groove (1301), a mounting groove (1302), a pull rod (1303), a flat plate (1304), a first spring (1305), a first hydraulic chamber (1306), a first piston (1307), a first piston rod (1308), a second hydraulic chamber (1309), a second piston (1310) and a second piston rod (1311). The groove (1301) is provided at the middle position of the bottom end of the mounting seat (7). The spherical cover (8) is vertically slidably arranged inside the groove (1301). The top of the groove (1301) is provided with a mounting groove (1302). The top of the spherical cover (8) is vertically fixed with a pull rod (1303), and the top of the pull rod (1303) is located inside the mounting groove (1302). The top of the pull rod (1303) is horizontally fixed with a flat plate (1304). A first spring (1305) is provided at the bottom of the plate (1304) and the inner bottom end of the mounting groove (1302); a first hydraulic chamber (1306) is evenly provided at the bottom end of the mounting groove (1302); a first piston (1307) is vertically slidably provided inside the first hydraulic chamber (1306); a first piston rod (1308) is fixed between the top end of the first piston (1307) and the bottom of the plate (1304); a second hydraulic chamber (1309) is evenly provided on the outer side of the bottom end of the mounting seat (7); the number of the second hydraulic chambers (1309) is the same as the number of the first hydraulic chambers (1306); the top ends of the second hydraulic chambers (1309) are respectively connected to the bottom ends of the first hydraulic chambers (1306); a second piston (1310) is slidably provided at the inner top ends of the second hydraulic chambers (1309); and a second piston rod (1311) is fixed to the bottom ends of the second pistons (1310).

2. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: An arc-shaped groove (1201) is provided at the middle position of the top of the clamp seat (11), the lower ball (12) is located inside the arc-shaped groove (1201), and a funnel-shaped opening is provided at the top of the arc-shaped groove (1201).

3. The vacuum arc furnace for melting and forming titanium ingots according to claim 1, characterized in that: The top end of the T-shaped plug rod (15) is in an arc shape, and the inner top shape of the slot (14) is the same as that of the T-shaped plug rod (15).

4. The vacuum arc furnace for melting and forming titanium ingots according to claim 3, characterized in that: The diameter of the open bottom end of the slot (14) is greater than half the inner diameter of the vacuum chamber (2), and the inner side of the slot (14) is coated with a wear-resistant coating.

5. The vacuum arc furnace for melting and forming titanium ingots according to claim 4, characterized in that: The fixing mechanism (16) comprises a slide groove (1601), a trapezoidal plug block (1602), a second spring (1603) and a pulling assembly. The slide grooves (1601) are evenly arranged on the inner side of the slot (14) in a circular array. Trapezoidal plug blocks (1602) are slidably arranged inside the slide grooves (1601). A second spring (1603) is arranged between the trapezoidal plug block (1602) and the inner end of the slide groove (1601). A pulling assembly for controlling the trapezoidal plug block (1602) to move toward the inside of the slide groove (1601) is arranged inside the clamp seat (11).

6. The vacuum arc furnace for melting and forming titanium ingots according to claim 5, characterized in that: The pulling assembly comprises a gear (1604), a first rack (1605), a second rack (1606) and a fixed ring (1608); the gear (1604) is rotatably mounted on the outer side of the end of the slide groove (1601); the top of the gear (1604) is meshed with the first rack (1605); the first rack (1605) is slidably mounted inside the clamp seat (11) and fixedly connected to the end of the trapezoidal plug block (1602); the outer side of the gear (1604) is vertically meshed with the second rack (1606); the second rack (1606) is slidably connected to the clamp seat (11) and extends to the top of the clamp seat (11); a fixed ring (1608) is horizontally fixed to the inner wall of the vacuum chamber (2); the inner diameter of the fixed ring (1608) is larger than the outer diameter of the mounting seat (7), and the fixed ring (1608) is located vertically above the second rack (1606).

7. The vacuum arc furnace for melting and forming titanium ingots according to claim 6, characterized in that: A connecting ring (1607) is fixed between the top ends of the second racks (1606), and the connecting ring (1607) is parallel to the top of the clamping seat (11).

8. The vacuum arc furnace for melting and forming titanium ingots according to claim 7, characterized in that: Four groups of second piston rods (1311) are provided, and the second piston rods (1311) are distributed in a ring array at the bottom of the mounting seat (7).

9. The vacuum arc furnace for melting and forming titanium ingots according to claim 8, characterized in that: An annular groove (1312) is provided on the top of the clamping seat (11), the annular groove (1312) is located directly below the second piston rod (1311), and an anti-slip groove is provided on the bottom end of the second piston rod (1311).

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