Electrode pull rod device and vacuum consumable furnace

Abstract

The present application relates to the field of vacuum furnace metallurgy technology, and in particular to an electrode pull rod device and a vacuum consumable furnace. The electrode pull rod device comprises: a conductive pull rod movable along its own axial direction, one end of the conductive pull rod being used to connect to a consumable electrode; a vacuum sleeve sleeved around the outer periphery of the end of the conductive pull rod for connecting to the consumable electrode, the inner wall of the vacuum sleeve being provided with an insulating layer; and an insulating sleeve disposed between the outer periphery of the conductive pull rod and the insulating layer of the vacuum sleeve. The present application constructs a full-path insulation protection system through a redundant design of double insulation, reducing the risk of arcing caused by single insulation failure during the movement and conduction of the conductive pull rod, thereby extending the service life of the electrode pull rod device.

Description

Technical Field

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

[0002] A vacuum consumable electrode arc furnace, also known as a vacuum consumable furnace, uses an arc as a heat source to melt metal in a vacuum environment. It is primarily used for melting refractory and rare metals, and is particularly widely used in the melting of titanium and titanium alloys. The conductive tie rod plays a central role in vacuum consumable furnace melting. Its primary function is to conduct high current at low voltage. Under normal circumstances, the current is transmitted to the consumable electrode through the conductive tie rod. However, during long-stroke alignment adjustments, the safety clearance between the conductive tie rod and the vacuum sleeve on its outer side is insufficient. This clearance can easily exceed the insulation threshold, causing arc discharge, which can affect component life and functional stability. Summary of the Invention

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

[0004] On the one hand, the present application provides an electrode pull rod device, comprising: a conductive pull rod, movable along its own axial direction, one end of the conductive pull rod being used to connect to a consumable electrode; a vacuum sleeve, sleeved on the outer peripheral side of the end of the conductive pull rod for connecting to the consumable electrode, the inner wall of the vacuum sleeve being provided with an insulating layer; and an insulating sleeve, arranged between the outer peripheral side of the conductive pull rod and the insulating layer of the vacuum sleeve.

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

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

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

[0008] In a possible implementation, the insulating sleeve is made of a composite material of glass fiber cloth and epoxy resin, and the mass percentage of the glass fiber cloth is 10%.

[0009] In a possible implementation, the vacuum sleeve is made of stainless steel, and the insulation layer is made of high-temperature resistant insulating varnish.

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

[0011] In one possible implementation, the electrode pull rod device also includes a cylinder with a piston built in the cylinder. The piston is connected to the second rod. The piston divides the interior of the cylinder into two spaces with alternating ventilation 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 one possible implementation, the electrode pull rod device also 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 along its own axial direction; the second connecting plate and the first connecting plate are arranged at intervals along the axial direction, and a support rod is also provided between the first connecting plate and the second connecting plate, and a travel switch is provided at both ends of the support rod along its own axial direction.

[0013] On the other hand, the present application also provides a vacuum consumable furnace, comprising: a furnace body with a built-in crucible; a vacuum chamber shell, arranged above the furnace body, and the vacuum chamber shell and the furnace body are detachably sealed and docked, and a vacuum pumping system is connected to the outside of the vacuum chamber shell; and an electrode pull rod device in each embodiment of the present application, one end of the conductive pull rod of the electrode pull rod device extends into the vacuum chamber shell, and the other end of the conductive pull rod is connected to the consumable electrode, and the consumable electrode and the crucible are arranged facing each other in the vertical direction.

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

[0015] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0016] Figure 1 A schematic structural diagram of an electrode pull rod device provided in an embodiment of the present application;

[0017] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of area A in the middle.

[0018] The reference numerals are as follows:

[0019] 10. Electrode pull rod device;

[0020] 1. Conductive pull rod; 11. First rod; 12. Second rod;

[0021] 2. Vacuum sleeve; 21. Insulation layer;

[0022] 3. Insulating sleeve; 4. First connecting plate; 5. Second connecting plate; 6. Lifting assembly; 61. Motor; 62. Screw rod; 63. Nut; 7. Support rod; 8. Travel switch; 9. Cylinder. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions of this application in conjunction with the embodiments. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] An embodiment of the present application provides a vacuum consumable furnace, comprising a furnace body, a vacuum chamber shell, and an electrode pull rod device 10 .

[0025] Specifically, a crucible is built into the furnace body, and a vacuum chamber housing is positioned above the furnace body. The vacuum chamber housing and the furnace body are detachably sealed and docked, and a vacuum pumping system is externally connected to the vacuum chamber housing. The electrode pull rod assembly 10 comprises a conductive rod 1 and a vacuum sleeve 2 sleeved around the outer periphery of the conductive rod 1. The conductive rod 1 can be a copper bar. One end of the conductive rod 1 slides through the vacuum chamber housing, and the other end of the conductive rod 1 is clamped to a consumable electrode via a clamping assembly. The consumable electrode and the crucible are arranged vertically opposite each other.

[0026] Optionally, the furnace body includes an upper furnace body and a lower furnace body, the upper furnace body is sealed and connected to the lower furnace body, a crucible is installed inside the lower furnace body, and a sandwich cooling water chamber is also provided outside the crucible in the furnace body. One end of the conductive pull rod 1 of the electrode pull rod device 10 can slide through the vacuum chamber shell through a dynamic sealing structure, and the other end of the conductive pull rod 1 is connected to the consumable electrode, and the consumable electrode and the crucible are arranged opposite each other in the vertical direction. The vacuum consumable furnace is a furnace in which the conductive pull rod 1 heats the consumable electrode through a DC arc under vacuum conditions. In the absence of slag and vacuum conditions, the consumable electrode is rapidly melted by the high temperature of the DC arc and re-solidified in a water-cooled crucible. The heat of the arc causes the consumable electrode to melt and eventually drip into the crystallizer to obtain the desired product.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] To this end, 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 rod 1 and the insulating layer 21 of the vacuum sleeve 2. The insulating sleeve 3 completely isolates the conductive rod 1 from the vacuum sleeve 2. Even if the first core protection measure fails, that is, the insulation of the insulating layer 21 on the inner wall of the vacuum sleeve 2 fails, the second core protection measure, that is, the insulating sleeve 3, can effectively prevent the occurrence of arcing problems, avoid damage to the conductive rod 1 due to arcing, achieve protection for the conductive rod 1, and improve the service life of the conductive rod 1.

[0035] In addition, the insulating sleeve 3 of the second core protection measure in this embodiment serves as the main insulation measure to isolate the conductive rod 1 from direct contact with the vacuum sleeve 2; and the insulating layer 21 of the vacuum sleeve 2 of the first core protection measure serves as an auxiliary insulation measure. The two have the effect of dual protection. When a single insulation method fails, such as partial detachment 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 risk between the conductive rod 1 and the vacuum sleeve 2.

[0036] According to the electrode pull rod device 10 and vacuum consumable furnace provided in the present application, an insulating layer 21 is provided on the inner wall of the vacuum sleeve 2, and an insulating sleeve 3 is provided between the outer peripheral side of the conductive pull rod 1 and the insulating layer 21 of the vacuum sleeve 2, thereby forming a double-insulated redundant design, constructing a full-path insulation protection system, expanding the insulation coverage, reducing the risk of arcing caused by insulation failure of the conductive pull rod 1 during movement and conduction, significantly reducing the probability of failure caused by process defects (such as uneven coating) or mechanical wear, and extending the service life of the electrode pull rod device 10.

[0037] In some embodiments, along the axial end of the conductive rod 1 facing the consumable electrode, the end surface of the insulating sleeve 3 is closer to the consumable electrode than the end surface of the vacuum sleeve 2 .

[0038] like Figure 2 As shown, at the axial end of the conductive rod 1 facing the consumable electrode, the end surface of the insulating sleeve 3 is closer to the consumable electrode than the end surface of the vacuum sleeve 2, resulting in the extended length of the insulating sleeve 3 being greater than the extended length of the vacuum sleeve 2. Because the conductive rod 1 is movable vertically along its own axis, extending the length of the insulating sleeve 3 can effectively prevent the conductive rod 1 from contacting the vacuum sleeve 2, thereby reducing the possibility of electrical conduction between the conductive rod 1 and the vacuum sleeve 2.

[0039] In some embodiments, the length difference between the end surface of the insulating sleeve 3 and the end surface of the vacuum sleeve 2 is ≥20 mm.

[0040] like Figure 2As shown, the extension length of the insulating sleeve 3 is greater than the extension length of the vacuum sleeve 2, and the length difference d between the two along the end surface of the axial end of the conductive rod 1 facing the consumable electrode is ≥ 20 mm. Such an arrangement allows the insulation coverage of the insulating sleeve 3 to extend synchronously with the axial movement of the conductive rod 1, thereby increasing the safety distance between the conductive rod 1 and the surrounding vacuum sleeve 2 and reducing the possibility of arc discharge caused by the distance between the two exceeding the insulation threshold.

[0041] 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 a single-side radial dimension L of the gap is ≥15 mm.

[0042] like Figure 2 As 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 radial dimension of the gap is L≥15mm. In a vacuum environment, the volatile matter of the insulating layer 21 may affect the vacuum degree. As an auxiliary insulation measure, the insulating layer 21 can suppress the creeping discharge of the conductive rod 1 through the vacuum gap. For example, when the vacuum degree drops to 10 - When the pressure drops to 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.

[0043] Therefore, by designing a reasonable spacing between the insulating layer 21 and the insulating sleeve 3, as well as an appropriate length of the insulating sleeve 3, the insulating layer 21 can be completely separated from the conductive pull rod 1, without any insulating dead corners, providing an optimal insulating structure, effectively protecting the conductive pull rod 1, avoiding arcing, and improving the service life of the electrode pull rod device 10.

[0044] In some embodiments, the insulating sleeve 3 is made of a composite material of glass fiber cloth and epoxy resin, and the mass percentage of the glass fiber cloth is 10%.

[0045] The insulating sleeve 3 can be made of G10, a composite material composed of 10% glass fiber cloth and epoxy resin. This provides excellent insulation, resists electrical conductivity, resists corrosion from chemicals such as acids and alkalis, and is impermeable to moisture or liquids. It also exhibits high wear resistance, making it suitable for applications requiring friction and wear, preventing significant wear between the conductive rod 1 and the insulating sleeve 3 during axial movement. Furthermore, the insulating sleeve 3 is strong enough to withstand significant forces without breaking or deforming.

[0046] In some embodiments, the vacuum sleeve 2 is made of stainless steel, and the insulating layer 21 is made of high-temperature resistant insulating paint.

[0047] Optionally, the vacuum sleeve 2 is made of 304 stainless steel, and the thickness of the insulating layer 21 can be approximately 0.05 mm. The insulating layer 21 can be a high-temperature resistant insulating varnish applied to the inner wall of the vacuum sleeve 2. The insulating layer 21 is composed of a polymer base material, an inorganic crystalline material with high volume resistivity and a compact structure, such as aluminum oxide or silicon nitride, as a filler, and produced microparticles as a high-temperature film-forming material, forming a high-temperature resistant insulating varnish that effectively provides insulation.

[0048] In some embodiments, the conductive pull rod 1 includes a first rod 11 and a second rod 12 sleeved on the outer circumference 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 clamp.

[0049] Optionally, the second rod 12 is 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, with a gap between the first rod 11 and the second rod 12. The end of the second rod 12 can be clamped by a clamp.

[0050] Optionally, the clamp is a pneumatic clamping mechanism, which can greatly ensure the coaxiality requirements of the clamping, realize automatic centering and positioning clamping without clearance, prevent the axial direction of the consumable electrode and the positioning center line of the conductive pull rod 1 from radial displacement, and reduce the possibility of side arcs burning the crucible wall due to poor alignment between the conductive pull rod 1 and the consumable electrode during vacuum smelting.

[0051] In some embodiments, the electrode pulling rod device 10 also includes a cylinder 9, which has a piston built in it. The piston is connected to the second rod 12. The piston divides the interior of the cylinder 9 into two spaces with alternating ventilation 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.

[0052] Optionally, the cylinder 9 is disposed within the furnace body above the second rod 12. A piston is built into the cylinder 9, the lower end of which is connected to the second rod 12. This allows the second rod 12 to move the consumable electrode up and down while also driving the cylinder 9 up and down. The piston inside the cylinder 9 divides the interior of the cylinder 9 into upper and lower spaces, each of which can be ventilated to enable the piston to move up and down within the cylinder 9. During actual operation, when air is inflated below the interior of the cylinder 9, the piston drives the second rod 12 upward, separating the consumable electrode from the second rod 12. When air is deflated below the interior of the cylinder 9, the consumable electrode and the second rod 12 are tightly fitted and clamped.

[0053] In some embodiments, the electrode pull rod device 10 also 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 axial direction; the second connecting plate 5 and the first connecting plate 4 are arranged at intervals along the axial direction, and a support rod 7 is also arranged between the first connecting plate 4 and the second connecting plate 5, and a travel switch 8 is respectively provided at both ends of the support rod 7 along its own axial direction.

[0054] 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 its 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 shell and is used to drive it to rise and fall. Figure 1 As shown, the lifting end of the lifting assembly 6 is provided with a main shaft. The lifting assembly 6 includes a motor 61, a screw 62, and a nut 63. The motor 61 can be a servo motor to achieve automated 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 screw 62. The other end of the screw 62 is connected to the conductive rod 1. The nut 63 cooperates with the screw 62 to form a screw-nut transmission pair. The nut 63 is connected to the end of the conductive rod 1 away from the consumable electrode.

[0055] In this way, motor 61 drives screw 62 to rotate. After screw 62 rotates, it drives nut 63 to move up and down, thereby driving conductive rod 1 and the consumable electrode below conductive rod 1 to rise and fall within the furnace body. Because conductive rod 1 is located within vacuum sleeve 2 and is made of metal, arcing may occur when the gap between conductive rod 1 and vacuum sleeve 2 gradually decreases due to the deflection of conductive rod 1. Therefore, providing insulating sleeve 3 between the outer wall of conductive rod 1 and vacuum sleeve 2 can effectively prevent arcing, avoid damage to conductive rod 1 due to arcing, and thus protect conductive rod 1.

[0056] Two support rods 7 are positioned around the conductive rod 1, between the first connecting plate 4 and the second connecting plate 5, to assist in supporting the axial movement of the conductive rod 1 and prevent axial deviation. A travel switch 8 is positioned at each axial end of the support rod 7 to limit the axial displacement of the conductive rod 1. The specific position of the travel switch 8 is related to the travel of the conductive rod 1, ensuring that the conductive rod 1 can continuously reciprocate up and down during the arc starting, steady-state, and thermal capping stages of consumable electrode smelting without causing insulation failure with the surrounding vacuum sleeve 2.

[0057] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0058] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0059] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0060] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electrode pull rod device, characterized in that: include: A conductive pull rod is movable along its own axial direction, and one end of the conductive pull rod is used to connect to the consumable electrode; a vacuum sleeve, sleeved on the outer peripheral side of one end of the conductive pull rod for connecting to the consumable electrode, the inner wall of the vacuum sleeve being provided with an insulating layer; as well as an insulating sleeve, disposed between the outer circumference of the conductive pull rod and the insulating layer of the vacuum sleeve; Along one axial end of the conductive pull rod facing the consumable electrode, an end surface of the insulating sleeve is closer to the consumable electrode than an end surface of the vacuum sleeve; The length difference between the end surface of the insulating sleeve and the end surface of the vacuum sleeve is ≥20 mm; A gap is formed between the insulating layer of the vacuum sleeve and the outer wall of the insulating sleeve, and a single-side radial dimension of the gap is ≥15 mm.

2. The electrode pull rod device according to claim 1, characterized in that: The insulating sleeve is made of a composite material of glass fiber cloth and epoxy resin, and the mass percentage of the glass fiber cloth is 10%.

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

4. The electrode pull rod device according to any one of claims 1 to 3, characterized in that: The conductive pull rod includes a first rod and a second rod sleeved on the outer circumference of the first rod. The second rod moves axially relative to the first rod, and the second rod clamps the consumable electrode through a clamper.

5. The electrode pull rod device according to claim 4, characterized in that: The electrode pulling rod device also includes a cylinder having a built-in piston, which is connected to the second rod. The piston divides the interior of the cylinder into two spaces that are alternately ventilated to drive the second rod to move upward and separate from the consumable electrode or drive the second rod to clamp the consumable electrode.

6. The electrode pull rod device according to claim 5, characterized in that: It also 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 rod to drive the conductive rod to move along its own axial direction; The second connecting plate and the first connecting plate are spaced apart in the axial direction, and a support rod is further provided between the first connecting plate and the second connecting plate. The two ends of the support rod along the axial direction are respectively provided with travel switches.

7. A vacuum consumable furnace, characterized in that: include: A furnace body with a built-in crucible; A vacuum chamber housing is provided above the furnace body, and the vacuum chamber housing and the furnace body are detachably sealed and docked, and a vacuum pumping system is externally connected to the vacuum chamber housing; as well as The electrode pull rod device according to any one of claims 1 to 6, wherein one end of the conductive pull rod of the electrode pull rod device can slidably pass through the vacuum chamber shell, and the other end of the conductive pull rod is connected to a consumable electrode, and the consumable electrode and the crucible are arranged opposite each other in a vertical direction.

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