Electrode pull rod device and consumable electrode vacuum furnace

Abstract

The invention relates to the technical field of vacuum furnace metallurgy, in particular to an electrode pull rod device and a consumable electrode vacuum furnace, and the electrode pull rod device comprises a conductive pull rod which can move in the axial direction of the conductive pull rod, and one end of the conductive pull rod is used for being connected with a consumable electrode; the vacuum sleeve is arranged on the peripheral side of the end, used for being connected with the consumable electrode, of the conductive pull rod in a sleeving mode, and an insulating layer is arranged on the inner wall of the vacuum sleeve; and the insulating sleeve is arranged between the peripheral side of the conductive pull rod and the insulating layer of the vacuum sleeve. According to the invention, a full-path insulation protection system is constructed through dual-insulation redundancy design, the arcing risk caused by single insulation failure in the movement and conduction process of the conductive pull rod is reduced, and the service life of the electrode pull rod device is prolonged.

Description

Technical Field

[0001] This application relates to the technical field of vacuum furnace metallurgy, and particularly relates to an electrode pull rod device and a vacuum consumable furnace. Background Art

[0002] The vacuum consumable electrode arc furnace, abbreviated as the vacuum consumable furnace, is an electric furnace that uses an arc as a heat source to melt metals in a vacuum environment. It is mainly used for melting refractory metals and rare metals, and is particularly widely used in the field of titanium and titanium alloy melting. During the melting process of the vacuum consumable furnace, the conductive pull rod is in a core position. The main function of the conductive pull rod is to conduct electricity at a large current and low voltage. Under normal circumstances, the current is transmitted to the consumable electrode through the conductive pull rod. When the conductive pull rod makes a long-stroke centering adjustment, the safety distance between the conductive pull rod and the vacuum sleeve on its outer peripheral side is insufficient, and it is extremely easy to cause arc discharge due to the distance breaking through the insulation threshold, affecting the service life or functional stability of the components. Summary of the Invention

[0003] This application provides an electrode pull rod device and a vacuum consumable furnace, which construct a full-path insulation protection system through a redundant design of double insulation, reduce the risk of arcing caused by insulation failure during the movement and conduction of the conductive pull rod, and extend the service life of the electrode pull rod device.

[0004] On the one hand, this application provides an electrode pull rod device, including: a conductive pull rod that is axially movable along itself, and one end of the conductive pull rod is used to connect to a consumable electrode; a vacuum sleeve that is sleeved on the outer peripheral side of the end of the conductive pull rod for connecting to the consumable electrode, and an insulating layer is provided on the inner wall of the vacuum sleeve; and an insulating sleeve that is provided between the outer peripheral side of the conductive pull rod and the insulating layer of the vacuum sleeve.

[0005] In a possible implementation manner, along the axial end of the conductive pull rod facing the consumable electrode, the end face of the insulating sleeve is closer to the consumable electrode than the end face of the vacuum sleeve.

[0006] In a possible implementation manner, the length difference between the end face of the insulating sleeve and the end face of the vacuum sleeve is ≥20 mm.

[0007] In a possible implementation manner, a gap is formed between the insulating layer of the vacuum sleeve and the outer wall of the insulating sleeve, and the unilateral radial dimension of the gap is ≥15 mm.

[0008] In a possible implementation manner, the material of the insulating sleeve is a composite material synthesized from fiberglass cloth and epoxy resin, and the mass percentage of the fiberglass cloth is 10%.

[0009] In a possible implementation manner, the material of the vacuum sleeve is stainless steel, and the material of the insulating layer is high-temperature resistant insulating paint.

[0010] In a possible implementation, the conductive pull rod includes a first rod and a second rod sleeved on the outer peripheral side of the first rod. The second rod moves axially relative to the first rod, and the second rod clamps the consumable electrode through a gripper.

[0011] In a possible implementation, the electrode pull rod device further includes a cylinder. A piston is disposed inside the cylinder. The piston is connected to the second rod. The piston divides the interior of the cylinder into two alternately ventilated spaces to drive the second rod to move upward and separate from the consumable electrode or drive the second rod to clamp the consumable electrode.

[0012] In a possible implementation, the electrode pull rod device further includes a first connecting plate, a second connecting plate, and a lifting assembly. One end of the lifting assembly is connected to the first connecting plate, and the other end of the lifting assembly is connected to the conductive pull rod to drive the conductive pull rod to move axially along itself; the second connecting plate is axially spaced from the first connecting plate, and a support rod is further disposed between the first connecting plate and the second connecting plate. Travel switches are respectively disposed at both ends of the support rod along its axial direction.

[0013] On the other hand, the present application further provides a vacuum consumable furnace, including: a furnace body with a crucible disposed inside; a vacuum chamber housing disposed above the furnace body, and the vacuum chamber housing is detachably and hermetically docked with the furnace body. A vacuum pumping system is connected to the outside of the vacuum chamber housing; and the electrode pull rod device of each embodiment of the present application. One end of the conductive pull rod of the electrode pull rod device extends into the vacuum chamber housing, and the other end of the conductive pull rod is connected to the consumable electrode. The consumable electrode and the crucible are disposed opposite to each other in the vertical direction.

[0014] According to the electrode pull rod device and the vacuum consumable furnace provided by the present application, by providing an insulating layer on the inner wall of the vacuum sleeve, and at the same time providing an insulating sleeve between the outer peripheral side of the conductive pull rod and the insulating layer of the vacuum sleeve, a redundant design of double insulation is formed, a full-path insulation protection system is constructed, the insulation coverage range is expanded, the risk of arcing caused by insulation failure during the movement and conduction of the conductive pull rod is reduced, the failure probability caused by process defects (such as uneven coating) or mechanical wear is significantly reduced, and the service life of the electrode pull rod device is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the electrode pull rod device provided by the embodiment of the present application; Figure 2 isFigure 1 Schematic enlarged structure diagram of the middle region A.

[0017] The reference numerals are as follows: 10. Electrode pull rod device; 1. Conductive pull rod; 11. First rod; 12. Second rod; 2. Vacuum sleeve; 21. Insulating layer; 3. Insulating sleeve; 4. First connecting plate; 5. Second connecting plate; 6. Lifting assembly; 61. Motor; 62. Lead screw; 63. Nut; 7. Support rod; 8. Travel switch; 9. Cylinder barrel. Specific embodiments

[0018] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are 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 of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0019] An embodiment of the present application provides a vacuum consumable furnace, including a furnace body, a vacuum chamber housing, and an electrode pull rod device 10.

[0020] Specifically, a crucible is disposed inside the furnace body, the vacuum chamber housing is disposed above the furnace body, and the vacuum chamber housing is detachably and hermetically docked with the furnace body. A vacuum pumping system is connected to the outside of the vacuum chamber housing. The electrode pull rod device 10 includes a conductive pull rod 1 and a vacuum sleeve 2 sleeved on the outer peripheral side of the conductive pull rod 1. The conductive pull rod 1 can be a copper busbar. One end of the conductive pull rod 1 slidably passes through the vacuum chamber housing, and the other end of the conductive pull rod 1 clamps a consumable electrode through a clamping assembly. The consumable electrode and the crucible are disposed opposite to each other in the vertical direction.

[0021] Optionally, the furnace body includes an upper furnace body and a lower furnace body. The upper furnace body is hermetically connected to the lower furnace body. A crucible is installed inside the lower furnace body. A sandwich-type cooling water chamber is further disposed outside the crucible inside the furnace body. One end of the conductive pull rod 1 of the electrode pull rod device 10 slidably passes through the vacuum chamber housing through a dynamic sealing structure. The other end of the conductive pull rod 1 is connected to a consumable electrode. The consumable electrode and the crucible are disposed opposite to each other in the vertical direction. The vacuum consumable furnace heats the consumable electrode by a direct current arc under a vacuum condition. Under a slag-free and vacuum condition, the consumable electrode is rapidly melted under the high temperature of the direct current arc and then re-solidified in the water-cooled crucible. The consumable electrode is melted by the heat of the arc drawing, and finally drips into the mold to obtain the required product.

[0022] During melting in a vacuum consumable furnace, the conductive rod 1 plays a central role. Its primary function is to conduct high current and low voltage. Under normal circumstances, the current is transferred to the consumable electrode through the conductive rod 1. However, during long-stroke alignment adjustments, the safety clearance between the conductive rod 1 and the vacuum sleeve 2 on its outer periphery is insufficient. This clearance can easily exceed the insulation threshold, triggering arc discharges and affecting component lifespan and functional stability.

[0023] To this end, the electrode pull rod device 10 provided in the embodiment of the present application constructs a full-path insulation protection system through a double-insulated redundant design, thereby reducing the risk of arcing caused by insulation failure during the movement and conduction of the conductive rod 1 and extending the service life of the electrode pull rod device 10.

[0024] Figure 1 This is a schematic diagram of the structure of the electrode pull rod device provided in an embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the enlarged structure of area A in the middle.

[0025] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides an electrode pull rod device 10, including a conductive pull rod 1, a vacuum sleeve 2 and an insulating sleeve 3.

[0026] The conductive rod 1 is movable along its axial direction, with one end of the conductive rod 1 connected to a consumable electrode. A vacuum sleeve 2 is sleeved around the outer periphery of the end of the conductive rod 1 connected to the consumable electrode. The inner wall of the vacuum sleeve 2 is provided with an insulating layer 21. An insulating sleeve 3 is disposed between the outer periphery of the conductive rod 1 and the insulating layer 21 of the vacuum sleeve 2.

[0027] In order to reduce the risk of arcing caused by insulation failure of the conductive pull rod 1 due to its conduction with the vacuum sleeve 2 during movement and conduction, the present application constructs two core protection measures, among which the first core protection measure is to provide an insulating layer 21 on the inner wall of the vacuum sleeve 2.

[0028] The insulating layer 21 can be applied to the inner wall of the vacuum sleeve 2 by a spraying process or a brushing process. In this way, the conductive rod 1 is isolated from the inner wall of the vacuum sleeve 2 by the insulating layer 21, which can reduce the possibility of insulation failure between the conductive rod 1 and the vacuum sleeve 2. However, since the inner wall of the vacuum sleeve 2 may have processing lines, corners or complex structures, it is difficult to evenly apply the insulating layer 21 to the inner wall of the vacuum sleeve 2, and the uneven coating may cause electric field distortion and trigger partial discharge. In addition, since the volatiles of the paint may affect the vacuum degree in a vacuum environment, conventional spraying or brushing processes are difficult to operate in a vacuum chamber and it is difficult to accurately control the coating thickness. For example, if the coating thickness deviation is greater than 20%, sagging or bubbles will occur, which may affect the insulation effect of the insulating layer 21.

[0029] Therefore, the present application also constructs a second core protection measure, that is, an insulating sleeve 3 is arranged between the outer peripheral side of the conductive pull rod 1 and the insulating layer 21 of the vacuum sleeve 2. The insulating sleeve 3 completely isolates the conductive pull rod 1 from the vacuum sleeve 2. Even if the first core protection measure fails, that is, the insulating layer 21 on the inner wall of the vacuum sleeve 2 fails to insulate, through the second core protection measure, namely the insulating sleeve 3, the occurrence of arcing can be effectively prevented, the damage of the conductive pull rod 1 caused by arcing can be avoided, the protective effect on the conductive pull rod 1 can be realized, and the service life of the conductive pull rod 1 can be extended.

[0030] In addition, the insulating sleeve 3 of the second core protection measure in this embodiment serves as the main insulation measure to isolate the direct contact between the conductive pull rod 1 and the vacuum sleeve 2; while the insulating layer 21 of the vacuum sleeve 2 of the first core protection measure serves as the auxiliary insulation measure. The two play a dual protection effect. When a single insulation method fails, such as local peeling of the insulating layer 21 or wear of the insulating sleeve 3, the other insulation method can still block the current path, greatly reducing the possibility of arcing between the conductive pull rod 1 and the vacuum sleeve 2.

[0031] According to the electrode pull rod device 10 and the vacuum consumable furnace provided by the present application, by arranging an insulating layer 21 on the inner wall of the vacuum sleeve 2 and simultaneously arranging an insulating sleeve 3 between the outer peripheral side of the conductive pull rod 1 and the insulating layer 21 of the vacuum sleeve 2, a redundant design of double insulation is formed, a full-path insulation protection system is constructed, the insulation coverage range is expanded, the arcing risk caused by insulation failure during the movement and conduction of the conductive pull rod 1 is reduced, the failure probability caused by process defects (such as uneven coating) or mechanical wear is significantly reduced, and the service life of the electrode pull rod device 10 is extended.

[0032] In some embodiments, along the axial end of the conductive pull rod 1 facing the consumable electrode, the end face of the insulating sleeve 3 is closer to the consumable electrode than the end face of the vacuum sleeve 2.

[0033] As Figure 2 shown, along the axial end of the conductive pull rod 1 facing the consumable electrode, the end face of the insulating sleeve 3 is closer to the consumable electrode than the end face of the vacuum sleeve 2, so that the protruding length of the insulating sleeve 3 is greater than the protruding length of the vacuum sleeve 2. Since the conductive pull rod 1 can move up and down along its own axis, lengthening the length of the insulating sleeve 3 can effectively block the possibility of contact between the conductive pull rod 1 and the vacuum sleeve 2, thereby reducing the possibility of conduction between the conductive pull rod 1 and the vacuum sleeve 2.

[0034] In some embodiments, the length difference between the end face of the insulating sleeve 3 and the end face of the vacuum sleeve 2 is ≥20 mm.

[0035] As Figure 2As shown, the protruding length of the insulating sleeve 3 is greater than that of the vacuum sleeve 2, and the length difference d between the two along the axial end face of the consumable electrode towards the conductive rod 1 is ≥ 20 mm. Such a setting can make the insulation coverage range of the insulating sleeve 3 extend synchronously with the axial movement of the conductive rod 1, increase the safety distance between the conductive rod 1 and the surrounding vacuum sleeve 2, and reduce the possibility of arc discharge caused by the distance breaking through the insulation threshold between the two.

[0036] In some embodiments, a gap is formed between the insulating layer 21 of the vacuum sleeve 2 and the outer wall of the insulating sleeve 3, and the unilateral radial dimension L of the gap is ≥ 15 mm.

[0037] As Figure 2 shown, a gap is formed between the insulating layer 21 of the vacuum sleeve 2 and the outer wall of the insulating sleeve 3, and the unilateral radial dimension L of the gap is ≥ 15 mm. The volatiles of the insulating layer 21 in a vacuum environment may affect the vacuum degree. As an auxiliary insulation measure, the insulating layer 21 can inhibit the surface discharge of the conductive rod 1 through the vacuum gap. For example, when the vacuum degree drops to 10 - ³ Pa, the insulating layer 21 can increase the discharge starting voltage by more than 30%, reducing the possibility of partial discharge caused by electric field distortion.

[0038] Thus, through the reasonable spacing design between the insulating layer 21 and the insulating sleeve 3, and the appropriate length of the insulating sleeve 3, the insulating layer 21 can be completely separated from the conductive rod 1 without insulation dead corners, providing the best insulation structure, effectively protecting the conductive rod 1, avoiding arcing, and extending the service life of the electrode rod device 10.

[0039] In some embodiments, the material of the insulating sleeve 3 is a composite material synthesized from fiberglass cloth and epoxy resin, and the mass percentage of the fiberglass cloth is 10%.

[0040] The material of the insulating sleeve 3 can be G10, that is, a composite material synthesized from 10% fiberglass cloth and epoxy resin, making the insulating sleeve 3 have good insulation performance, not easy to conduct electricity, able to resist the corrosion of chemical substances such as acids and alkalis, not being penetrated by water vapor or liquid; at the same time, it has high wear resistance, is suitable for occasions that need to withstand friction and wear, and prevents large wear between the conductive rod 1 and the insulating sleeve 3 during the axial movement of the conductive rod 1 along its own axis. At the same time, the insulating sleeve 3 has high strength and can withstand great forces without being easily damaged or deformed.

[0041] In some embodiments, the material of the vacuum sleeve 2 is stainless steel, and the material of the insulating layer 21 is high-temperature resistant insulating paint.

[0042] Optionally, the material of the vacuum sleeve 2 is stainless steel 304, and the thickness of the insulating layer 21 can be about 0.05 mm. The insulating layer 21 can be a high-temperature resistant insulating paint coated on the inner wall of the vacuum sleeve 2, which is composed of a polymer base material, inorganic crystal materials with high volume resistivity and a compact structure, such as alumina, silicon nitride, etc. as fillers, and mainly uses the produced fine particles as the high-temperature film-forming substance to form the high-temperature resistant insulating paint, achieving an effective insulating effect.

[0043] In some embodiments, the conductive pull rod 1 includes a first rod 11 and a second rod 12 sleeved on the outer peripheral side of the first rod 11. The second rod 12 moves axially relative to the first rod 11, and the second rod 12 clamps the consumable electrode through a gripper.

[0044] Optionally, the second rod 12 has a hollow structure. The first rod 11 and the second rod 12 are coaxially arranged, and the second rod 12 can move axially relative to the first rod 11. There is a gap between the first rod 11 and the second rod 12. The end of the second rod 12 can clamp the consumable electrode through a gripper.

[0045] Optionally, the gripper is a pneumatic clamping mechanism. The gripper can greatly ensure the coaxiality requirements of clamping, achieve gapless automatic centering and positioning clamping, prevent radial displacement of the axial direction of the consumable electrode from the positioning center line of the conductive pull rod 1, and reduce the possibility of arc burning of the crucible wall due to poor centering between the conductive pull rod 1 and the consumable electrode during vacuum smelting.

[0046] In some embodiments, the electrode pull rod device 10 further includes a cylinder 9. A piston is disposed inside the cylinder 9. The piston is connected to the second rod 12. The piston divides the interior of the cylinder 9 into two alternately ventilated spaces to drive the second rod 12 to move upward and separate from the consumable electrode or drive the second rod 12 to clamp the consumable electrode.

[0047] Optionally, the cylinder 9 is disposed in the furnace body above the second rod 12. A piston is disposed inside the cylinder 9. The lower end of the piston is connected to the second rod 12. In this way, while the second rod 12 can drive the consumable electrode to lift and lower, it will also drive the cylinder 9 to lift and lower. The piston inside the cylinder 9 divides the interior of the cylinder 9 into upper and lower spaces. The upper and lower spaces can be ventilated respectively to enable the piston to move up and down inside the cylinder 9. During actual operation, when the lower part inside the cylinder 9 is inflated, the piston can drive the lower second rod 12 to move upward, causing the consumable electrode to separate from the second rod 12. When the air is released from the lower part inside the cylinder, the consumable electrode fits and clamps with the second rod 12.

[0048] In some embodiments, the electrode pull rod device 10 further includes a first connecting plate 4, a second connecting plate 5 and a lifting assembly. One end of the lifting assembly 6 is connected to the first connecting plate 4, and the other end of the lifting assembly 6 is connected to the conductive pull rod 1 to drive the conductive pull rod 1 to move along its own axis; the second connecting plate 5 is axially spaced from the first connecting plate 4, and a support rod 7 is further provided between the first connecting plate 4 and the second connecting plate 5. Travel switches 8 are provided at both ends of the support rod 7 along its own axis.

[0049] Optionally, the electrode pull rod device 10 further includes a turntable located on one side of the furnace body and fixed to the ground at the bottom. A lifting assembly 6 is provided above the turntable. The lifting end of the lifting assembly 6 is fixedly connected to the vacuum chamber housing and is used to drive its lifting. As Figure 1 shown, a main shaft is provided at the lifting end of the lifting assembly 6. The lifting assembly 6 includes a motor 61, a lead screw 62 and a nut 63. The motor 61 can be a servo motor to achieve automatic control. The motor 61 is fixedly connected to the first connecting plate 4. The output shaft of the motor 61 is connected to one end of the lead screw 62. The other end of the lead screw 62 is connected to the conductive pull rod 1. The nut 63 and the lead screw 62 cooperate to form a lead screw-nut transmission pair. The nut 63 is connected to the end of the conductive pull rod 1 far from the consumable electrode.

[0050] In this way, the motor 61 drives the lead screw 62 to rotate. After the lead screw 62 rotates, it drives the nut 63 to move up and down, thereby driving the conductive pull rod 1 and the consumable electrode below the conductive pull rod 1 to lift inside the furnace body. Since the conductive pull rod 1 is located inside the vacuum sleeve 2 and the conductive pull rod 1 is made of metal, when the gap between the conductive pull rod 1 and the vacuum sleeve 2 gradually decreases due to the deflection deformation of the conductive pull rod 1, an arcing problem will occur. Therefore, an insulating sleeve 3 is provided between the outer wall of the conductive pull rod 1 and the vacuum sleeve 2, which can effectively prevent the occurrence of the arcing problem, avoid the damage of the conductive pull rod 1 due to arcing, and achieve the protection effect on the conductive pull rod 1.

[0051] Two support rods 7 are arranged on the circumference of the conductive pull rod 1 and are located between the first connecting plate 4 and the second connecting plate 5, and are used to assist in supporting the axial movement of the conductive pull rod 1 to prevent the conductive pull rod 1 from deviating axially. Travel switches 8 are provided at both ends of the support rod 7 along its own axis to limit the axial displacement of the conductive pull rod 1. The specific position of the travel switch 8 is related to the stroke of the conductive pull rod 1, ensuring that the conductive pull rod 1 continuously reciprocates up and down during the arc starting stage, steady state stage and hot top capping stage of the consumable electrode smelting, and will not cause insulation failure with the vacuum sleeve 2 on its circumference.

[0052] It should be noted that phrases such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when describing a specific feature, structure, or characteristic in combination with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure, or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0053] It should be easily understood that the terms "on", "above", and "over" in this disclosure should be interpreted in the broadest manner, such that "on" not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "over" not only include the meaning of "above" or "over something", but may also include the meaning of "above" or "over something" with no intermediate features or layers therebetween (i.e., directly on something).

[0054] In addition, for the convenience of description, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used in the text may be interpreted accordingly.

[0055] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article, or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the said element.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrode tie rod device, characterized in that, Comprising: A conductive pull rod, which is axially movable along itself, and one end of the conductive pull rod is used to connect a consumable electrode; A vacuum sleeve, sleeved on the outer peripheral side of the end of the conductive pull rod for connecting the consumable electrode, and an insulating layer is provided on the inner wall of the vacuum sleeve; and An insulating sleeve, disposed between the outer peripheral side of the conductive pull rod and the insulating layer of the vacuum sleeve.

2. The electrode tie rod device according to claim 1, characterized in that, Along the axial end of the conductive pull rod facing the consumable electrode, the end face of the insulating sleeve is closer to the consumable electrode than the end face of the vacuum sleeve.

3. The electrode pull rod device according to claim 2, characterized in that The length difference between the end face of the insulating sleeve and the end face of the vacuum sleeve is ≥20 mm.

4. The electrode tie rod device according to claim 1, characterized in that, A gap is formed between the insulating layer of the vacuum sleeve and the outer wall of the insulating sleeve, and the unilateral radial dimension of the gap is ≥15 mm.

5. The electrode pull rod device according to claim 1, characterized in that The insulating sleeve is made of a composite material synthesized from fiberglass cloth and epoxy resin, and the mass percentage of the fiberglass cloth is 10%.

6. The electrode pull rod device according to claim 1, characterized in that The vacuum sleeve is made of stainless steel, and the insulating layer is made of a high-temperature resistant insulating paint.

7. The electrode tie rod device according to any one of claims 1 to 6, characterized in that The conductive pull rod includes a first rod and a second rod sleeved on the outer peripheral side of the first rod. The second rod moves axially relative to the first rod, and the second rod clamps the consumable electrode through a gripper.

8. The electrode pull rod device according to claim 7, wherein The electrode pull rod device further includes a cylinder barrel, a piston is disposed inside the cylinder barrel, the piston is connected to the second rod, and the piston divides the interior of the cylinder barrel into two alternately ventilated spaces to drive the second rod to move upward and separate from the consumable electrode or drive the second rod to clamp the consumable electrode.

9. The electrode pull rod device according to claim 8, characterized in that, It further includes a first connecting plate, a second connecting plate and a lifting assembly. One end of the lifting assembly is connected to the first connecting plate, and the other end of the lifting assembly is connected to the conductive pull rod to drive the conductive pull rod to move axially along itself; The second connecting plate and the first connecting plate are axially spaced apart, and a support rod is further disposed between the first connecting plate and the second connecting plate. Travel switches are respectively disposed at both ends of the support rod along its axial direction.

10. A consumable electrode vacuum arc furnace, characterized in that, Comprising: A furnace body, with a crucible built therein; A vacuum chamber housing, disposed above the furnace body, and the vacuum chamber housing is detachably and hermetically docked with the furnace body. A vacuum pumping system is connected to the outside of the vacuum chamber housing; And The electrode pull rod device according to any one of claims 1 to 9, one end of the conductive pull rod of the electrode pull rod device slidably passes through the vacuum chamber housing, the other end of the conductive pull rod is connected to a consumable electrode, and the consumable electrode and the crucible are disposed opposite to each other in the vertical direction.

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