A conductive stick bottom protection device

Abstract

The application discloses a kind of electrically conductive material pole bottom protection device, it is related to electric furnace technical field.Electrically conductive material pole bottom protection device includes: limiting sleeve, drive mechanism and ball screw, the output of limiting sleeve, drive mechanism and the axis of ball screw coincide;The inner wall of limiting sleeve is sequentially provided with first connecting area, toothless area and second connecting area along its axial direction;The output of drive mechanism is connected with limiting sleeve by first connecting area;Ball screw and limiting sleeve have two kinds of connection states.The application designs new electrical control and mechanical control idea by mechanical protection mechanism and electrical protection mechanism, carries out atmosphere protection electric furnace's electrically conductive material pole bottom protection, by perfect electrical control and mechanical structure design, and according to process requirement, reasonable control, the protection device can effectively solve electrically conductive material pole in carrying out bottom operation, due to bottom protection failure leads to system damage to cause economic loss and personnel injury.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electroslag furnace, in particular to a kind of electrically conductive material pole bottom protection device. BACKGROUND

[0002] Electrically conductive material pole bottom protection device is a key protection device according to atmosphere protection electroslag furnace process design, and its process characteristics are as follows: the electrically conductive material pole needs to clamp the steel ingot to be smelted firmly before smelting in atmosphere protection electroslag furnace, and this step needs to be protected by bottom protection device to the whole system to prevent the electrically conductive material pole from being stationary when bottoming in the smelting process, and the ball screw continues to rotate to damage the whole system.

[0003] And the structure of the existing electrically conductive material pole bottom protection device is as follows: a travel switch and a toggle piece arranged on the electrically conductive material pole are used, when the electrically conductive material pole clamps the steel ingot to be smelted and needs to be bottomed, after the electrically conductive material pole is stationary, the travel switch is touched by the toggle piece arranged on the electrically conductive material pole, and then the driving mechanism stops moving, but the bottom protection design has certain defects, the travel switch will cause mechanical fatigue in frequent movement, resulting in limit failure, which will cause the driving mechanism to continuously drive the ball screw to rotate and damage the whole system, causing economic losses and safety accidents, so a kind of electrically conductive material pole bottom protection device is proposed. SUMMARY

[0004] The purpose of the present application is to provide a kind of electrically conductive material pole bottom protection device to solve the problems raised in the above background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a kind of electrically conductive material pole bottom protection device, comprising: limit sleeve, driving mechanism and ball screw, the axis of the limit sleeve, the output end of the driving mechanism and the ball screw coincide;The inner wall of the limit sleeve is sequentially provided with first connecting area, toothless area and second connecting area along its axial direction;The output end of the driving mechanism is connected with the limit sleeve through the first connecting area;The ball screw and the limit sleeve have two connection states, which are normal state and protection state respectively, when the ball screw is in normal state, the top end of the ball screw is connected with the limit sleeve through the second connecting area, at this time, the output shaft of the driving mechanism can drive the ball screw to rotate through the limit sleeve, when the ball screw is in protection state, the top end of the ball screw is connected with the limit sleeve through the toothless area, at this time, the output shaft of the driving mechanism can only drive the limit sleeve to idle;When the electrically conductive material pole is not bottomed, the ball screw is in normal state, when the electrically conductive material pole is bottomed, the ball screw is switched from normal state to protection state.

[0006] Preferably in the technical scheme, the electrical protection mechanism comprises a trigger assembly and a trigger switch, the trigger assembly is used to trigger the trigger switch when the conductive material rod touches the bottom, and the trigger switch is used to stop the driving mechanism.

[0007] Preferably in the technical scheme, the trigger assembly comprises a ball nut, a trigger chamber and a sensing sleeve, the ball nut is movably screwed with the ball screw, and the ball nut is fixedly connected with the sensing sleeve; the trigger chamber is fixedly arranged on the screw guide sleeve, the ball nut is located inside the trigger chamber, a limiting structure is arranged between the ball nut and the trigger chamber, and the limiting structure can prevent the ball nut and the trigger chamber from rotating relatively in the axial direction; when the ball screw is in the normal state, the sensing sleeve is located outside the trigger chamber, and during the switching of the ball screw from the normal state to the protection state, the ball nut drives the sensing sleeve to retract into the trigger chamber.

[0008] Preferably in the technical scheme, the limiting structure comprises a limiting block fixedly connected to the outside of the ball nut or the sensing sleeve, and a limiting groove opened in the inner wall of the trigger chamber, the limiting groove extends in the direction parallel to the axial line of the ball screw, and the limiting block is matched with the limiting groove.

[0009] Preferably in the technical scheme, the trigger switch is at least two travel switches or proximity switches.

[0010] Preferably in the technical scheme, the output end of the driving mechanism is connected to the first connecting area of the limiting sleeve through the first connecting structure, the top end of the ball screw is connected to the second connecting area of the limiting sleeve through the second connecting structure when the ball screw is in the normal state, at this time, the ball screw and the limiting sleeve cannot rotate relatively in the axial direction, during the switching of the ball screw from the normal state to the protection state, the ball screw performs axial displacement until the ball screw and the limiting sleeve rotate relatively in the axial direction, the mechanical protection mechanism is switched from the normal state to the protection state, the ball screw can relatively displace the limiting sleeve in the first direction parallel to the axial line of the ball screw, and the axial limitation between the ball screw and the limiting sleeve is released when the mechanical protection mechanism is in the protection state.

[0011] Preferably in the technical scheme, the first protection cover is further included, the first connecting structure, the limiting sleeve and the second connecting structure are arranged inside the first protection cover, the axial line of the first protection cover is parallel to the axial line of the ball screw, the driving mechanism is fixed to the first end of the first protection cover, and the second end of the first protection cover is fixed to the material rod support.

[0012] Preferably in the technical solution, the first connecting structure is fixed to the output end of the driving mechanism and the first end of the limiting sleeve.

[0013] Preferably in the technical solution, the first connecting structure comprises: a first limiting connecting piece arranged at the output end of the driving mechanism, a plurality of first limiting external teeth arranged on the outer side surface parallel to the first direction and extending along the first direction, and a first limiting internal tooth arranged in the first connecting area and corresponding to the first limiting external tooth.

[0014] Preferably in the technical solution, the second connecting structure comprises: a second limiting connecting piece arranged at the first end of the ball screw, a plurality of second limiting external teeth arranged on the outer side surface parallel to the first direction and extending along the first direction, and a second limiting internal tooth arranged in the second connecting area and corresponding to the second limiting external tooth.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] The conductive material rod bottom touch protection device designs a new electrical control and mechanical control idea through the mechanical protection mechanism and the electrical protection mechanism, performs the conductive material rod bottom touch protection of the atmosphere protection electroslag furnace, and effectively solves the economic loss and personnel injury caused by the system damage due to the failure of the bottom touch protection during the bottom touch operation of the conductive material rod.

[0017] The conductive material rod bottom touch protection device adopts the proximity switch without direct contact and the double limiting position for control, avoids the mechanical fatigue of the bottom touch protection device, and avoids the reduction or failure of the limiting sensitivity caused by the mechanical fatigue.

[0018] Meanwhile, the mechanical protection mechanism is designed for the electrical control failure phenomenon, and the nylon limiting sleeve in the mechanical protection mechanism can perform the last protection in the condition of electrical control failure, when the bottom is touched, the ball screw continues to rotate, if the electrical protection fails, the second limiting connecting piece on the ball screw will rise to the gearless area of the limiting sleeve when the ball screw rotates to a certain extent, the driving mechanism is idling, thereby ensuring the safety of the equipment.

[0019] The conductive material rod bottom protection device has been successfully applied to the electric slag operation area door type structure atmosphere protection electric slag furnace, realizes the protection of the conductive material rod bottom, finally realizes the stability of the conductive material rod bottom and the safety of the equipment, meets the stable high yield production requirements of the electric slag operation area door type structure atmosphere protection electric slag furnace, steadily improves the production capacity, and the economic benefits are remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a perspective view of the material rod support in the atmosphere protection electric slag furnace;

[0021] Figure 2 It is a front view of the material rod support in the atmosphere protection electric slag furnace;

[0022] Figure 3 It is a right view of the material rod support in the atmosphere protection electric slag furnace;

[0023] Figure 4 It is a perspective view of the driving mechanism and the conductive material rod connection provided by the present application;

[0024] Figure 5 It is a rear view of the driving mechanism and the conductive material rod connection provided by the present application;

[0025] Figure 6 It is a perspective view of the mechanical protection mechanism provided by the present application;

[0026] Figure 7 It is a sectional view of the mechanical protection mechanism provided by the present application;

[0027] Figure 8 It is an explosion view of the mechanical protection mechanism provided by the present application;

[0028] Figure 9 It is a perspective view of the trigger assembly provided by the present application;

[0029] Figure 10 It is a sectional view of the trigger assembly provided by the present application.

[0030] In the figure: 1, material rod support; 2, driving mechanism; 3, conductive material rod; 4, limiting rod; 5, limiting platform; 6, mechanical protection mechanism; 601, first protection cover; 602, second limiting connecting piece; 603, first limiting connecting piece; 604, limiting sleeve; 605, toothless area; 7, electrical protection mechanism; 701, second protection cover; 702, trigger chamber; 703, ball nut; 704, induction sleeve; 8, ball screw; 9, proximity switch; 10, screw guide sleeve. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0032] It should be noted that, in the description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, it should be understood that, for the convenience of description, the sizes of the various components shown in the drawings are not drawn in accordance with the actual proportional relationship, for example, the thickness or width of certain layers can be exaggerated relative to other layers.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further specifically discussed and described in the description of subsequent drawings.

[0035] Before understanding the technical solutions, it should be known that, as shown in Figure 10 Because the original structure of the present application is relatively complex, in order to facilitate understanding of the technical solutions of the present application, the threads in the ball screw 8 and the ball nut 703 are not drawn, and the rolling steel balls in the ball nut 703 are also not drawn.

[0036] At the same time, it should be clear that, as shown in Figures 1 to 3As shown, the conductive material rod 3 in the atmosphere protection electroslag furnace is generally arranged on the material rod support 1, the driving mechanism 2 is installed on the top of the material rod support 1 in the prior art, and the output end of the driving mechanism 2 is connected with the ball screw 8, the inside of the conductive material rod 3 is fixedly connected with the screw rod guide sleeve 10, the main function of the screw rod guide sleeve 10 is to make the gap between the ball screw 8 and the conductive material rod 3 smaller, so as to prevent shaking during movement, and the screw rod guide sleeve 10 is provided with the ball nut 703, the ball nut 703 is movably screwed with the ball screw 8, the ball nut 703 can drive the screw rod guide sleeve 10 and the conductive material rod 3 to move up and down along the axis of the ball screw 8, in order to make the conductive material rod 3 move axially along the ball screw 8 when the ball screw 8 rotates, a structure for preventing the conductive material rod 3 from rotating is further arranged, which comprises the limiting platform 5 arranged on the top of the conductive material rod 3 and the limiting rod 4 arranged on the material rod support 1 and extending in the direction parallel to the axis of the ball screw 8, the limiting platform 5 is provided with the limiting groove, the limiting groove is clamped with the limiting rod 4, and thus when the ball screw 8 rotates, the conductive material rod 3 will not rotate around the axis of the ball screw 8, but only move up and down along the axis of the ball screw 8.

[0037] In order to prevent the conductive material rod 3 from touching the bottom and causing damage to the equipment, as shown in Figure 4 and Figure 5 The application provides a technical solution: a conductive material rod bottom protection device, the limiting sleeve 604, the driving mechanism 2 and the ball screw 8, the axis of the output end of the driving mechanism 2 and the ball screw 8 coincides with the limiting sleeve 604, the inner wall of the limiting sleeve 604 is sequentially provided with the first connecting area, the toothless area 605 and the second connecting area along the axial direction, the output end of the driving mechanism 2 is connected with the limiting sleeve 604 through the first connecting area, the ball screw 8 has two connection states with the limiting sleeve 604, which are normal state and protection state, when the ball screw 8 is in the normal state, the top end of the ball screw 8 is connected with the limiting sleeve 604 through the second connecting area, at this time, the output shaft of the driving mechanism 2 can drive the ball screw 8 to rotate through the limiting sleeve 604, when the ball screw 8 is in the protection state, the top end of the ball screw 8 is connected with the limiting sleeve 604 through the toothless area 605, at this time, the output shaft of the driving mechanism 2 can only drive the limiting sleeve 604 to idle; when the conductive material rod 3 does not touch the bottom, the ball screw 8 is in the normal state, when the conductive material rod 3 touches the bottom, the ball screw 8 is switched from the normal state to the protection state, it should be clear that the driving mechanism 2 in the application can be various devices that can be used for driving, in this embodiment, since the conductive material rod 3 needs to be accurately controlled during transmission, the driving mechanism 2 adopts a servo motor.

[0038] In order to make the user further understand the present application, the structure connecting the output end of the driving mechanism 2 and the ball screw 8 is named as the mechanical protection mechanism 6, as shown in Figure 7 and Figure 8 The mechanical protection mechanism 6 includes a limiting sleeve 604, the output end of the driving mechanism 2 is connected with the limiting sleeve 604 through a first connecting structure, and the ball screw 8 is connected with the limiting sleeve 604 through a second connecting structure, when the ball screw 8 is in a normal state, the second connecting structure can generate axial limiting between the ball screw 8 and the limiting sleeve 604, preventing the relative rotation between the ball screw 8 and the limiting sleeve 604, during the switching of the ball screw 8 from the normal state to the protection state, the ball screw 8 can generate relative displacement with the limiting sleeve 604 along a first direction, the first direction is parallel to the axis of the ball screw 8, when the ball screw 8 is in the protection state, the axial limiting between the ball screw 8 and the limiting sleeve 604 is released, at this time, the servo motor is in idle running, and it cannot drive the ball screw 8 to rotate through the limiting sleeve 604.

[0039] Specifically, the second connecting structure includes a second limiting connecting piece 602, the second limiting connecting piece 602 is arranged at the first end of the ball screw 8, a plurality of second limiting external teeth are arranged on the outer side surface of the second limiting connecting piece 602 along the first direction, and a second limiting internal tooth corresponding to each second limiting external tooth is arranged on the second connecting area of the limiting sleeve 604, the second limiting internal tooth extends along the first direction, when the ball screw 8 is in the normal state, the second limiting external teeth on the second limiting connecting piece 602 are engaged with the second limiting internal teeth on the limiting sleeve 604, when the output end of the driving mechanism 2 rotates, it can drive the ball screw 8 to rotate through the limiting sleeve 604, when the conductive material rod 3 touches the bottom, the driving mechanism 2 still drives the ball screw 8 to rotate, at this time, since the conductive material rod 3 cannot move downward due to touching the bottom, the rotating ball screw 8 moves upward along the axis, and a toothless area 605 is arranged on the inner wall of the middle part of the limiting sleeve 604, when the second limiting external teeth on the second limiting connecting piece 602 are all in the toothless area 605, the engagement between the second limiting external teeth and the second limiting internal teeth is released, at this time, the driving mechanism 2 cannot drive the ball screw 8 to rotate through the limiting sleeve 604, that is, the driving mechanism 2 is in idle running, compared with the electrical protection method on the market, the protection failure rate of the mechanical protection mechanism 6 of the present application is basically zero, and the safety of the whole device can be greatly improved.

[0040] It should be known that the output end of the driving mechanism 2 can be directly fixed with the first end of the limiting sleeve 604 during design, but in order to further ensure the safety of the whole device, as shown in Figure 7 and Figure 8As shown, the first connecting structure can be used to connect the output end of the driving mechanism 2 and the first end of the limiting sleeve 604, wherein the first connecting structure comprises: a first limiting connecting piece 603, the first limiting connecting piece 603 is arranged at the output end of the driving mechanism 2, a plurality of first limiting external teeth are arranged on the outer side surface in parallel to the first direction along the first limiting connecting piece 603, the first limiting external teeth extend along the first direction, a first limiting internal tooth corresponding to the first limiting external tooth is arranged at the first connecting area of the limiting sleeve 604 and extends along the first direction, and the first limiting external tooth and the first limiting internal tooth are engaged, and the structure is similar to that of the second connecting structure. The advantage of such a split design is that when manufacturing the limiting sleeve 604, nylon material can be used. When the conductive material rod 3 touches the bottom due to some reasons and the ball screw 8 cannot rise, the limiting sleeve 604 made of nylon material will be damaged, and after the limiting sleeve 604 is damaged, the driving mechanism 2 will be idling.

[0041] It needs to be further clarified that in the above structure, the first limiting connecting piece 603 and the second limiting connecting piece 602 can be removed, and the first limiting external tooth is directly arranged on the output end of the driving mechanism 2, and the second limiting external tooth is directly arranged on the ball screw 8, as shown in Figure 8 As shown, the first limiting connecting piece 603 and the second limiting connecting piece 602 are both in the form of a circular tube, and they are both axially limited by the key groove and the key to the output end of the driving mechanism 2 and the ball screw 8 respectively. In use, the first limiting external tooth and the second limiting external tooth are both consumable parts, and when they are damaged, the first limiting connecting piece 603 and the second limiting connecting piece 602 can be directly replaced, which is fast and convenient.

[0042] At the same time, in order to protect the above structure, as shown in Figure 6 and Figure 7 The mechanical protection mechanism 6 further comprises a first protection cover 601, and the first connecting structure, the limiting sleeve 604 and the second connecting structure are all arranged inside the first protection cover 601, and the axis of the first protection cover 601 is parallel to the axis of the ball screw 8, as shown in Figure 1 and Figure 4 The driving mechanism 2 is fixed to the first end of the first protection cover 601, and the second end of the first protection cover 601 is fixed to the material rod support 1.

[0043] It needs to be clear that the mechanical protection mechanism 6 in the application is the last protection after the conductive material rod 3 touches the bottom, and the conventional bottom touch protection still adopts electrical protection, so in the embodiment, an electrical protection mechanism 7 also needs to be designed, the electrical protection mechanism 7 includes: a trigger assembly and a trigger switch, the trigger assembly is used to trigger the trigger switch in the process of switching the ball screw 8 from the normal state to the protection state, and the trigger switch is used to shut down the driving mechanism 2, which can be consistent with the electrical protection mechanism 7 in the prior art, and the bottom touch protection of the conductive material rod 3 is achieved by using a toggle element and a travel switch, and in another embodiment of the application, as shown in Figure 9 and Figure 10 The trigger assembly includes a ball nut 703, a trigger chamber 702 and a sensing sleeve 704, since the ball nut 703 is movably connected with the ball screw 8, the ball nut 703 is fixedly connected with the sensing sleeve 704, the trigger chamber 702 is fixedly arranged on the lead screw guide sleeve 10, the ball nut 703 is located inside the trigger chamber 702, a limiting structure is arranged between the ball nut 703 and the trigger chamber 702, the limiting structure can prevent the ball nut 703 and the trigger chamber 702 from rotating relatively in the axial direction, when the ball screw 8 is in the normal state, the sensing sleeve 704 is located outside the trigger chamber 702, and the trigger switch is a plurality of proximity switches 9, as shown in Figure 4 The plurality of proximity switches 9 are all mounted on the limiting platform 5, and the proximity switches 9 all point to the sensing sleeve 704, and the plurality of proximity switches 9 are all electrically connected with the driving mechanism 2, as shown in Figure 10 When the conductive material rod 3 touches the bottom and stops moving downward, at this time the ball screw 8 continues to rotate, and under the driving of the ball screw 8 and the action of the limiting structure, the ball nut 703 can also move downward along the axial direction of the ball screw 8, and the downward moving ball nut 703 can make the sensing sleeve 704 retract into the inside of the trigger chamber 702, when the proximity switch 9 detects the change of the sensing sleeve 704, the driving mechanism 2 is shut down, at this time, if the driving mechanism 2 is successfully shut down, the ball screw 8 stops rotating, if the driving mechanism 2 is not shut down through the proximity switch 9, the ball screw 8 will only switch from the normal state to the protection state, forming double protection, and in order to protect the trigger assembly, a second protective cover 701 is sleeved outside the trigger assembly, and the second protective cover 701 is fixedly connected with the bottom of the limiting platform 5.

[0044] The above-mentioned limiting structure can be similar to the limiting inner teeth and the limiting outer teeth structure on the first connecting structure and the second connecting structure, as another embodiment in the application, the limiting structure includes: a limiting block, the limiting block is fixedly connected to the outside of the ball nut 703 or the sensing sleeve 704, and a limiting groove is formed in the inner wall of the trigger chamber 702, the limiting groove extends in the direction parallel to the axial line of the ball screw 8, the limiting block is matched with the limiting groove, and the ball nut 703 and the sensing sleeve 704 can only move axially along the limiting groove, but cannot rotate axially.

[0045] The conductive material rod bottom protection device of the application is applied to the atmosphere protection electroslag furnace, the conductive material rod 3 is used to test the bottom limit of the clamp rod, and the reliability of the electrical protection mechanism 7 and the mechanical protection mechanism 6 is tested. The number of proximity switches 9 in the electrical protection mechanism 7 is two, which are named No. 1 and No. 2. During the test, the bottom limit of the No. 1 proximity switch is tested first. The conductive material rod 3 is operated to the bottom, and the limit transmits a signal to the PLC after the bottom is reached. The PLC receives the signal and cuts off the action instruction of the servo motor to stop the conductive material rod 3, thereby protecting the safety of the equipment. Similarly, the bottom limit of the No. 2 proximity switch is tested.

[0046] The above situation is tested 80 times by using the method, which can ensure the normality of the input and output signals, realize the function of stopping the action of the conductive material rod 3, achieve the protection effect, and meet the use performance of the equipment.

[0047] Further, how to use the mechanical protection mechanism 6 to protect again after the electrical protection mechanism 7 fails is tested, and the specific method is as follows: when the limits of the No. 1 proximity switch and the No. 2 proximity switch both fail (failure includes limit damage, limit control power loss, limit distance being too large, etc.), the PLC cannot receive the signal, and the conductive material rod 3 cannot stop the action. At this time, the ball screw 8 continues to go down, the mechanical protection mechanism 6 cuts off the connection between the servo motor and the ball screw 8, and the servo motor idles.

[0048] The above situation is tested 40 times by using the method, which can ensure the servo motor to idle, and realizes the bottom protection of the conductive material rod 3.

[0049] Although the embodiments of the application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. An electrically conductive stick bottom protection device, characterized in that, The application relates to a mechanical and electrical protection mechanism for a ball screw. The mechanical protection mechanism (6) comprises a limiting sleeve (604), the axis of the limiting sleeve (604), the output end of the driving mechanism (2) and the ball screw (8) are coincident; The inner wall of the limiting sleeve (604) is sequentially provided with a first connecting area, a toothless area (605) and a second connecting area along the axial direction; The output end of the driving mechanism (2) is connected with the limiting sleeve (604) through the first connecting area; The ball screw (8) has two connecting states with the limiting sleeve (604), namely a normal state and a protection state; when the ball screw (8) is in the normal state, the top end of the ball screw (8) is connected with the limiting sleeve (604) through the second connecting area; at this time, the output shaft of the driving mechanism (2) can drive the ball screw (8) to rotate through the limiting sleeve (604); when the ball screw (8) is in the protection state, the top end of the ball screw (8) is connected with the limiting sleeve (604) through the toothless area (605); at this time, the output shaft of the driving mechanism (2) can only drive the limiting sleeve (604) to rotate idly; When the conductive material rod (3) does not touch the bottom, the ball screw (8) is in the normal state; when the conductive material rod (3) touches the bottom, the ball screw (8) is switched from the normal state to the protection state; The application further comprises an electrical protection mechanism (7), which comprises a triggering assembly and a triggering switch; the triggering assembly is used for triggering the triggering switch when the conductive material rod (3) touches the bottom; the triggering switch is used for shutting down the driving mechanism (2); The triggering assembly comprises a ball nut (703), a triggering chamber (702) and a sensing sleeve (704); The ball nut (703) is movably connected with the ball screw (8); the ball nut (703) is fixedly connected with the sensing sleeve (704); The triggering chamber (702) is fixedly arranged on a screw guide sleeve (10); the ball nut (703) is located in the triggering chamber (702); a limiting structure is arranged between the ball nut (703) and the triggering chamber (702); the limiting structure can prevent the ball nut (703) and the triggering chamber (702) from rotating relatively in the axial direction; When the ball screw (8) is in the normal state, the sensing sleeve (704) is located outside the triggering chamber (702); during the switching of the ball screw (8) from the normal state to the protection state, the ball nut (703) drives the sensing sleeve (704) to retract into the triggering chamber (702); The limiting structure comprises: A limiting block which is fixedly connected to the outside of the ball nut (703) or the sensing sleeve (704); A limiting groove which is arranged on the inner wall of the triggering chamber (702) and extends along the direction parallel to the axis of the ball screw (8); the limiting block is matched with the limiting groove; The triggering switch is at least two travel switches or proximity switches (9).

2. A conductive stick bottoming protection device according to claim 1, wherein The output end of the driving mechanism (2) is connected with the first connecting area of the limiting sleeve (604) through a first connecting structure; When the ball screw (8) is in a normal state, the top end of the ball screw (8) is connected with the second connecting area of the limiting sleeve (604) through a second connecting structure, at this time, the ball screw (8) and the limiting sleeve (604) cannot produce relative rotation in the axial direction, and in the process of switching the ball screw (8) from the normal state to the protection state, the ball screw (8) produces axial displacement until the ball screw (8) and the limiting sleeve (604) produce relative rotation in the axial direction; When the mechanical protection mechanism (6) is switched from the normal state to the protection state, the ball screw (8) can produce relative displacement with the limiting sleeve (604) in a first direction, the first direction is parallel to the axial line of the ball screw (8), and when the mechanical protection mechanism (6) is in the protection state, the axial limiting between the ball screw (8) and the limiting sleeve (604) is released.

3. A conductive stick bottoming protection device according to claim 2, wherein Further comprising a first protection cover (601), the first connecting structure, the limiting sleeve (604) and the second connecting structure are all arranged inside the first protection cover (601), the axial line of the first protection cover (601) is parallel to the axial line of the ball screw (8), the driving mechanism (2) is fixed to the first end of the first protection cover (601), and the second end of the first protection cover (601) is fixed to the material rod support (1).

4. A conductive stick bottoming protection device according to claim 2, wherein The first connecting structure is that the output end of the driving mechanism (2) is fixed to the first end of the limiting sleeve (604).

5. A conductive stick bottoming protection device according to claim 2, wherein The first connecting structure comprises: A first limiting connecting piece (603) is arranged at the output end of the driving mechanism (2), a plurality of first limiting external teeth are arranged on the outer side surface parallel to the first direction of the first limiting connecting piece (603), and the first limiting external teeth extend in the first direction; A first limiting internal tooth corresponding to the first limiting external tooth is arranged in the first connecting area, the first limiting internal tooth extends in the first direction, and the first limiting external tooth and the first limiting internal tooth are engaged.

6. A conductive stick bottoming protection device according to claim 2, wherein The second connecting structure comprises: A second limiting connecting piece (602) is arranged at the first end of the ball screw (8), a plurality of second limiting external teeth are arranged on the outer side surface parallel to the first direction of the second limiting connecting piece (602), and the second limiting external teeth extend in the first direction; A second limiting internal tooth corresponding to the second limiting external tooth is arranged in the second connecting area, the second limiting internal tooth extends in the first direction, when the ball screw (8) is in the normal state, the second limiting external teeth on the second limiting connecting piece (602) are engaged with the second limiting internal teeth on the limiting sleeve (604), in the process of switching the ball screw (8) from the normal state to the protection state, the ball screw (8) makes the second limiting connecting piece (602) located in the toothless area (605) of the limiting sleeve (604), and the engagement between the second limiting external teeth and the second limiting internal teeth is released.

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