Hearth cleaning device of vacuum consumable electric arc furnace

Abstract

The invention relates to the technical field of metal smelting equipment, in particular to a hearth cleaning device of a vacuum consumable electric arc furnace, which comprises a mounting seat, a driving unit, a lifting mechanism and a hearth cleaning assembly, the driving unit is arranged on the mounting seat and is used for driving the lifting mechanism to rotate, and the lifting end of the lifting mechanism is connected with the hearth cleaning assembly; the chamber cleaning assembly comprises an opening mechanism and a plurality of arc-shaped plates, the arc-shaped plates are arranged at intervals in the circumferential direction of the lifting end of the lifting mechanism, arc-shaped grooves are formed in the bottoms of the inner walls of the arc-shaped plates in the circumferential direction, sliding seats are slidably connected into the arc-shaped grooves, elastic pieces are connected between the sliding seats and the two end faces in the arc-shaped grooves, and cleaning scrapers are arranged on the outer walls of the arc-shaped plates. A telescopic rod is connected between the top of the inner wall of the arc-shaped plate and the lifting end of the lifting mechanism. The opening mechanism is used for opening the arc-shaped plates so that the cleaning scraper can make contact with the inner wall of the hearth. The cleaning scraper is impacted in a force storage mode, and impurities are shoveled away.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting equipment, and in particular to a furnace cleaning device for a vacuum consumable arc furnace. Background Art

[0002] A vacuum consumable arc furnace is a device that uses the arc heat generated between a consumable electrode and a crucible for melting in a vacuum environment. In a vacuum environment, the high-temperature arc generated between the consumable electrode and the crucible causes the electrode to gradually melt and drip into the crucible, and the metal in the crucible is also melted. During the welding and melting process in the furnace, the molten pool splashes, the metal elements and their impurities volatilize, and they will adhere to the crucible and the inner wall of the furnace, forming a layer of black dirt. This layer of black dirt accumulates over time. If it is not cleaned in time, it will affect the vacuum degree of the vacuum consumable arc furnace during operation.

[0003] In order to clean the dirt adhered to the inner wall of the furnace, the existing patent announcement number CN118089427B discloses a furnace cleaning device for a vacuum consumable electric arc furnace. During use, high-pressure gas is passed into the air inlet valve through a high-pressure air pump, and the air inlet valve separates the high-pressure gas into the air inlet pressure pipe. Then, the high-pressure gas is passed into the air inlet nozzle through the air pressure pipe. The high-pressure gas ejected from the air pressure nozzle will spray and sweep the dirt in the electric arc furnace. When the air pressure nozzle sprays and sweeps the inner wall of the electric arc furnace to clean it, the water tank passes the water inside into the water sprinkler through the water flow pipe, and then the water sprinkler sprays water on the inner wall of the electric arc furnace to clean the inner wall of the electric arc furnace that has been sprayed and swept, thereby cleaning the inner wall of the electric arc furnace.

[0004] In summary, the existing disclosed furnace cleaning device of the above-mentioned vacuum consumable arc furnace cleans the dirt adhered to the inner wall of the furnace by means of high-pressure airflow and water spraying. However, cleaning the dirt adhered to the inner wall of the furnace by high-pressure airflow or high-pressure water flow has the following defects: First, impurities and dirt may be washed into the surrounding area during the cleaning process, increasing the difficulty of cleaning and the risk of secondary contamination; Second, moisture or water droplets will be generated during the cleaning process, which will have a negative impact on the vacuum system of the vacuum consumable arc furnace and affect the stability of the vacuum consumable arc furnace; Third, high-pressure airflow or water flow may cause erosion or corrosion to the inner wall of the furnace due to excessive pressure, thus affecting the service life of the furnace; Fourth, water resources are wasted due to cleaning, which is particularly important in areas with water shortages or where cost savings are needed. Summary of the invention

[0005] The present invention provides a furnace cleaning device for a vacuum consumable arc furnace, aiming to solve the technical problems that the furnace cleaning device of the existing vacuum consumable arc furnace will generate moisture or water droplets during the process of cleaning the inner wall of the furnace, which will have a negative impact on the vacuum system of the vacuum consumable arc furnace, and at the same time, the high-pressure airflow may cause scouring or corrosion to the inner wall of the furnace due to excessive pressure, thereby affecting the service life of the furnace.

[0006] To solve the above problems, the present invention adopts the following technical solutions: A furnace cleaning device for a vacuum consumable electric arc furnace comprises a mounting seat, a driving unit, a lifting mechanism and a chamber cleaning assembly, wherein the driving unit is arranged on the mounting seat and is used to drive the lifting mechanism to rotate and lift, the lifting end of the lifting mechanism is connected to the chamber cleaning assembly, the chamber cleaning assembly comprises a spreading mechanism and a plurality of arc plates, the plurality of arc plates are arranged at intervals along the circumference of the lifting end of the lifting mechanism, an arc groove is opened on the upper edge of the bottom of the inner wall of each arc plate in each circumference, a sliding seat is slidably connected in each arc groove, a first elastic member is connected between the sliding seat and one end face in the arc groove, and a second elastic member is connected between the sliding seat and the other end face in the arc groove; a cleaning scraper is arranged on the outer wall of each arc plate; a telescopic rod is connected to the top of the inner wall of each arc plate, and one end of each telescopic rod facing away from each arc plate is moved along the The circumferential sliding of the lifting end is arranged on the outer wall of the lifting end of the lifting mechanism; the spreading mechanism is arranged at the lifting end of the lifting mechanism and is hinged with each sliding seat, and the spreading mechanism rotates with the lifting mechanism to spread out multiple arc plates so that each cleaning scraper is in close contact with the inner wall of the furnace; the first arc bar and the second arc bar are respectively fixed on the opposite sides of the fixed end of each telescopic rod, and the arc shape of the first arc bar and the second arc bar is the same as the arc shape of the arc plate, and an elastic telescopic block that can be telescoped vertically is provided on the upper surface of each first arc bar, and the projection of the elastic telescopic block in the radial direction of the spreading mechanism is located within the spacing between the two arc plates; in two adjacent telescopic rods, the second arc bar on one telescopic rod can push the elastic telescopic block on the first arc bar on the other telescopic rod to retract.

[0007] The beneficial effects of the present invention are: When the furnace cleaning device of the vacuum consumable electric arc furnace of the present invention is used, the mounting seat is mounted on the port of the electric arc furnace that needs to be cleaned, the mounting seat is fixed to the port of the electric arc furnace, the chamber cleaning assembly is driven to descend to the area to be cleaned in the furnace of the electric arc furnace by the lifting mechanism, and then the plurality of arc plates are opened by the opening mechanism so that the cleaning scrapers on each arc plate are in contact with the inner wall of the furnace, and at this time, the lifting mechanism is driven by the driving unit to drive the chamber cleaning assembly to rotate so that the cleaning scrapers on each arc plate rotate to scrape off the dirt adhering to the furnace Dirt on the inner wall of the furnace; Due to the different adsorption degrees of dirt adhered to the inner wall of the furnace, in the process of cleaning the dirt and impurities on the inner wall of the furnace, assuming that an arc plate (hereinafter referred to as arc plate A) encounters harder dirt and impurities, and the rotating force of the cleaning scraper on the arc plate A cannot scrape off the harder dirt and impurities, the arc plate A will be in a static state due to the resistance of the harder dirt and impurities, but because the sliding seat on the arc plate A can slide along the arc groove on the arc plate A, and one end of the telescopic rod on the arc plate A is in contact with the arc plate A The other end of the telescopic rod on the arc plate A and the outer wall of the lifting end of the lifting mechanism can slide circumferentially relative to the lifting end of the lifting mechanism, so it will not affect the driving unit driving the lifting mechanism to rotate and drive the expansion mechanism to drive other arc plates (other arc plates except the arc plate A) to rotate; and because a first elastic member is connected between one side of the sliding seat on the arc plate A and one end face in the arc groove on the arc plate A, and a second elastic member is connected between the other side of the sliding seat and the other end face in the arc groove on the arc plate A, assuming that the chamber cleaning assembly rotates counterclockwise, the first elastic member and the second elastic member are arranged in sequence in the counterclockwise direction, and the first arc strip and the second arc strip are also arranged in sequence in the counterclockwise direction, then in the process of the expansion mechanism driving other arc plates (other arc plates except the arc plate A) to continue to rotate, the sliding seat on the arc plate A will continue to slide in the arc groove on the arc plate A in the counterclockwise direction, so that the first elastic member on the arc plate A is in a compressed state, and the second elastic member on the arc plate A is in a stretched state;The next arc plate adjacent to the arc plate A (hereinafter referred to as the arc plate B) moves counterclockwise toward the arc plate A. Since the projection of the elastic expansion block in the radial direction of the spreading mechanism is located within the spacing between the two arc plates, before the arc plate B contacts the arc plate A, the second arc strip on the arc plate B will first contact the elastic expansion block of the first arc strip on the arc plate A. In the process of the second arc strip on the arc plate B pushing the elastic expansion block on the first arc strip on the arc plate A to retract, the sliding seat on the arc plate B forces the second elastic member on the arc plate B to be in the compression position in the counterclockwise direction. In the state of compressed force, the compression force of the second elastic member acts on the arc plate B. Since the arc plate B continues to move counterclockwise, the first elastic member on the arc plate B is still in the initial state (uncompressed or unstretched state). Therefore, the release direction of the second elastic force on the arc plate B can only be released counterclockwise, so that the arc plate B hits the arc plate A counterclockwise, so that the cleaning scraper on the arc plate A scrapes off the harder dirt and impurities, so that the cleaning scraper on the arc plate A changes from scraping off dirt and impurities to shoveling off dirt and impurities, ensuring the cleaning effect of the present invention. ;

[0008] Furthermore, the spreading mechanism includes a lifting unit, a sleeve and a plurality of connecting rods. The sleeve is slidably mounted on the outer wall of the lifting end of the lifting mechanism, and the sleeve rotates with the lifting mechanism. The plurality of connecting rods correspond one-to-one to the plurality of arc plates. One end of each connecting rod is hinged to the sliding seat on each arc plate, and the other end of each connecting rod is hinged to the outer wall of the sleeve. The lifting unit is arranged at the lifting end of the lifting mechanism, and the lifting end of the lifting unit is drivingly connected to the sleeve, which is used to drive the sleeve to slide up and down relative to the lifting mechanism to spread the plurality of arc plates.

[0009] Each curved plate can be quickly opened.

[0010] Furthermore, an elastic sealing piston is provided at the bottom of the expansion mechanism. When the cleaning scraper is not in contact with the inner wall of the furnace, the outer wall of the elastic sealing piston is wrapped by the inner walls of multiple arc plates; when the cleaning scraper is in contact with the inner wall of the furnace, the outer wall of the elastic sealing piston is sealed with the inner wall of the furnace.

[0011] It can prevent dirt and impurities scraped off by the cleaning component on the inner wall of the furnace from falling into the furnace.

[0012] Furthermore, the elastic sealing piston is a solid truncated cone structure, and the outer diameter of the truncated cone gradually increases from top to bottom.

[0013] It is beneficial to improve the elastic expansion and contraction performance of the elastic sealing piston.

[0014] Furthermore, a slot is provided on the upper surface of the first arc-shaped strip, the elastic telescopic block comprises a telescopic block body and a telescopic spring, the telescopic block body is vertically slidably arranged in the slot, the bottom of the telescopic block body is connected to the bottom of the slot through the telescopic spring, and the top of the telescopic block body protrudes out of the slot; in each telescopic rod, a guide surface is provided on the side of the top of the telescopic block body facing away from the second arc-shaped strip.

[0015] In two adjacent telescopic rods, the second arc strip on one telescopic rod is conducive to pushing the elastic telescopic block of the first arc strip on the other telescopic rod to retract.

[0016] Furthermore, a limiting groove is provided at the bottom of the arc-shaped groove along the arc-shaped track of the arc-shaped groove, and a sliding part is provided at the bottom of the sliding seat, and the sliding part can slide in the limiting groove.

[0017] Improve the stability of the sliding seat sliding in the arc groove.

[0018] Furthermore, the mounting base includes a connecting plate and two fixed plates, the driving unit is arranged on the connecting plate, the opposite ends of the connecting plate are respectively connected and fixed to the tops of the two fixed plates, the spacing between the two fixed plates is greater than the outer diameter of the furnace, and a universal caster with a self-locking structure is arranged at the bottom of the fixed plate.

[0019] The mounting base can be conveniently moved and fixed on the port of the electric arc furnace, thereby improving the practicability of the furnace cleaning device of the vacuum consumable electric arc furnace of the present invention.

[0020] Furthermore, a third elastic member is connected between the fixed ends of two adjacent telescopic rods.

[0021] Improve the stability of the telescopic pole.

[0022] Furthermore, the driving unit includes a driving motor, a synchronous belt, a driving gear and a passive gear. The driving motor is arranged on a mounting seat. The output shaft of the driving motor extends vertically and is drivingly connected to the driving gear. The passive gear is rotatably arranged on the mounting seat. The driving gear and the passive gear are connected through the synchronous belt transmission. The passive gear is connected to the lifting mechanism to drive the lifting mechanism to rotate.

[0023] While saving vertical space, it drives the lifting mechanism to rotate.

[0024] Furthermore, the lifting mechanism includes a screw and a screw nut, a sliding groove is opened on the outer wall of the screw along its own axial direction, the sliding groove passes through the opposite ends of the screw, a toggle bar is arranged in the center inner side along the axial direction of the passive gear, the screw is passed through the center hole of the passive gear, and the toggle bar is slidably matched with the sliding groove, the screw nut is fixed on the mounting seat, the screw nut is located below the passive gear and is coaxial with the passive gear, the screw nut is threadedly connected to the screw, and the lifting speed of the screw is less than the rotation speed of the screw.

[0025] The screw rod can rotate and rise and fall simultaneously, driving the chamber cleaning assembly to fully clean the inner wall of the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a furnace cleaning device for a vacuum consumable arc furnace of the present invention; Figure 2 It is a structural schematic diagram of a passive gear involved in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a driving unit involved in an embodiment of the present invention; Figure 4 for Figure 1 A schematic diagram of the structure from another angle; Figure 5 for Figure 4 Sectional view at AA; Figure 6 for Figure 5 A schematic diagram of the enlarged structure at B in the middle; Figure 7 This is a schematic diagram of the structure of the connection between a screw rod, a cylinder, a sleeve and an elastic sealing piston according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the connection between the screw rod and the cylinder according to an embodiment of the present invention; Fig. 9 for Figure 8 A schematic diagram of the structure from another angle; Fig.10 It is a structural schematic diagram of a sleeve involved in an embodiment of the present invention; Fig.11 for Fig.10 A schematic diagram of the structure from another angle; Fig.12 It is a structural schematic diagram of a chamber cleaning assembly in an initial state according to an embodiment of the present invention; Fig.13 It is a structural schematic diagram of a chamber cleaning assembly in a working state according to an embodiment of the present invention; Fig.14 It is a structural schematic diagram of the connection between the lifting end of the lifting mechanism and the telescopic rod according to an embodiment of the present invention; Fig.15It is a schematic structural diagram of a fixed end of a telescopic rod according to an embodiment of the present invention; Fig.16 This is a schematic diagram of the structure of an elastic expansion block according to an embodiment of the present invention; Fig.17 This is a schematic diagram of the structure of the connection between the opening mechanism and the arc plate according to an embodiment of the present invention; Fig.18 for Fig.17 A schematic diagram of the structure from another angle; Fig.19 This is a schematic diagram of the structure of the connection between the sliding seat and the first elastic member and the second elastic member according to an embodiment of the present invention; Fig. 20 It is a structural schematic diagram of a chamber cleaning assembly according to an embodiment of the present invention; Fig.21 This is a structural schematic diagram of an embodiment of the present invention in which a mounting base is installed and fixed on a port of an electric arc furnace; Fig. 22 for Fig.21 A schematic diagram of the structure from another angle; Fig.23 for Fig. 22 Cross-sectional view at CC.

[0027] Reference numerals in the accompanying drawings: 1. Mounting seat; 10. Connecting plate; 11. Fixing plate; 12. Universal caster; 2. Driving unit; 20. Driving motor; 21. Driving gear; 22. Passive gear; 220. Toggle bar; 23. Synchronous belt; 3. Lifting mechanism; 30. Screw; 301. Slide; 31. Screw nut; 32. Cylinder; 320. Solid cylinder; 3201. Circular groove; 321. Hollow cylinder; 322. Connecting strip; 4. Cleaning assembly; 40. Opening mechanism; 401. Sleeve; 4011. Vertical groove; 402. Lifting unit; 403. Connecting rod; 4 1. Arc plate; 410. Cleaning scraper; 411. Cleaning brush; 412. Arc groove; 4121. Sliding seat; 4122. Sliding part; 413. First elastic member; 414. Second elastic member; 415. Limiting groove; 42. Telescopic rod; 420. Telescopic end; 421. Fixed end; 422. First arc strip; 4220. Notch; 423. Second arc strip; 424. Elastic telescopic block; 4241. Telescopic block body; 4242. Telescopic spring; 4243. Guide surface; 425. Third elastic member; 426. Elastic sealing piston; 5. Furnace chamber. DETAILED DESCRIPTION

[0028] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0029] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "width", "up", "down", "front", "back", "top" and "bottom" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] Please refer to Figure 1-Figure 23 The present invention provides a furnace cleaning device for a vacuum consumable arc furnace, comprising a mounting seat 1, a driving unit 2, a lifting mechanism 3 and a furnace cleaning assembly 4.

[0033] Reference Figure 1 and Figure 4 The mounting base 1 includes a connecting plate 10 and two fixing plates 11. The connecting plate 10 is provided with a driving unit 2. The opposite ends of the connecting plate 10 are respectively connected and fixed to the tops of the two fixing plates 11. The distance between the two fixing plates 11 is greater than the outer diameter of the furnace 5. A universal caster 12 with a self-locking structure is provided at the bottom of the fixing plate 11. The universal caster 12 with a self-locking structure can make the mounting base 1 move and lock at any time, so that it is convenient to move and install the mounting base 1 at the port of the electric arc furnace, thereby improving the practicality of the cleaning device for the furnace 5 of the vacuum consumable electric arc furnace of the present invention.

[0034] It should be noted that the self-locking structure on the universal caster 12 adopts the existing structure and will not be described here.

[0035] Reference Figure 1 , Figure 2 , Figure 3 and Fig.23 The driving unit 2 is arranged on the mounting seat 1, and is used to drive the lifting mechanism 3 to rotate and lift; the lifting end of the lifting mechanism 3 is connected to the chamber cleaning component 4, so that the chamber cleaning component 4 can rotate and lift with the lifting mechanism 3, thereby achieving the effect of the chamber cleaning component 4 to fully clean the inner wall of the furnace 5.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The driving unit 2 includes a driving motor 20, a synchronous belt 23, a driving gear 21 and a passive gear 22. The driving motor 20 is arranged on the mounting seat 1. The output shaft of the driving motor 20 extends vertically and is drivingly connected to the driving gear 21. The passive gear 22 is rotatably arranged on the mounting seat 1. The rotation axis of the passive gear 22 is parallel to the rotation axis of the driving gear 21. The driving gear 21 and the passive gear 22 are connected by a synchronous belt 23. The passive gear 22 is connected to the lifting mechanism 3 to drive the lifting mechanism 3 to rotate. This structure of the driving unit 2 can save vertical space to a certain extent, and can also realize the rotation of the lifting mechanism 3.

[0037] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 The lifting mechanism 3 includes a screw rod 30 and a screw rod nut 31. A slide groove 301 is provided on the outer wall of the screw rod 30 along its own axial direction. The slide groove 301 passes through the opposite ends of the screw rod 30. A toggle bar 220 is provided in the center of the passive gear 22 along the axial direction of the passive gear 22. The screw rod 30 is inserted into the center hole of the passive gear 22, and the toggle bar 220 is slidably matched with the slide groove 301. The screw rod nut 31 is fixed on the mounting plate of the mounting seat 1. The screw rod nut 31 is located below the passive gear 22 and is coaxial with the passive gear 22. The screw rod nut 31 is threadedly connected with the screw rod 30. Of course, the lifting speed of the screw rod 30 is less than the rotation speed of the screw rod 30 to avoid affecting the cleaning effect of the cleaning assembly 4 on the inner wall of the furnace 5.

[0038] In addition, refer to Figure 5-Figure 9 The bottom of the screw rod 30 is fixedly connected with a coaxial cylinder 32, the upper end of the cylinder 32 is a solid cylinder 320, and the lower end of the cylinder 32 is a hollow cylinder 321. Among them, the main function of the cylinder 32 is to facilitate the connection between the cleaning assembly 4 and the bottom of the screw rod 30, and the cylinder 32 on the bottom of the screw rod 30 is also the lifting end of the lifting mechanism 3.

[0039] It should be noted that the lifting speed of the screw rod 30 is lower than the rotation speed of the screw rod 30, which can be achieved by designing the pitch of the screw rod 30. The pitch of the screw rod 30 is related to the lifting speed of the screw rod 30. The pitch of the screw rod 30 is an important parameter that affects the lifting speed of the screw rod 30. The larger the pitch of the screw rod 30, the farther the distance the screw rod 30 moves per rotation, and thus the lifting speed is faster in the same time. On the contrary, the smaller the pitch of the screw rod 30, the higher the transmission accuracy of the screw rod 30. Since the cleaning assembly 4 is connected to the bottom of the screw rod 30, the rotation speed of the cleaning assembly 4 is the same as the rotation speed of the screw rod 30, which is determined by the drive motor 20. By designing the pitch size of the screw rod 30, the lifting speed of the screw rod 30 is lower than the rotation speed of the screw rod 30, so that the lifting speed of the screw rod 30 is lower than the rotation speed of the cleaning assembly 4, thereby achieving the effect of preventing the cleaning assembly 4 from cleaning the inner wall of the furnace 5.

[0040] In summary, it can be understood that when the furnace cleaning device of the vacuum consumable arc furnace of the present invention is in use, the mounting seat 1 is moved to the arc furnace port that needs to be cleaned by the universal caster 12, and the mounting seat 1 is locked by the self-locking structure on the universal caster 12. At this time, the driving motor 20 drives the active gear 21 to drive the passive gear 22 to rotate. Since the slide groove 301 on the screw rod 30 runs through the opposite ends of the screw rod 30, and the toggle bar 220 in the center hole of the passive gear 22 slides with the slide groove 301, the rotation of the passive gear 22 will drive the screw rod 30 to rotate; and since the screw nut 31 is located below the passive gear 22, and the screw nut 31 is fixed on the mounting plate and is coaxial with the passive gear 22, the threaded transmission of the screw rod 30 and the screw nut 31 will realize the lifting and lowering of the screw rod 30. During the lifting and lowering process of the screw rod 30, the toggle bar 220 in the center hole of the passive gear 22 slides along the slide groove 301 on the screw rod 30. Based on this, the driving motor 20 drives the screw rod 30 to drive the chamber cleaning assembly 4 to rotate and descend into the furnace 5, and then the driving motor 20 drives the screw rod 30 to drive the chamber cleaning assembly 4 to rotate and ascend to achieve comprehensive cleaning of the inner wall of the furnace 5, thereby ensuring the cleaning effect of the chamber cleaning assembly 4, thereby avoiding the chamber cleaning assembly 4 only cleaning the upper half or lower half of the inner wall of the furnace 5.

[0041] Reference Figure 5 , Figure 6 , Fig.13 , Fig.17 , Fig.18 and Fig. 20The chamber cleaning assembly 4 includes a spreading mechanism 40 and a plurality of arc plates 41. The plurality of arc plates 41 are arranged at intervals along the circumference of the lifting end of the lifting mechanism 3. An arc groove 412 is opened along the circumference of the bottom of the inner wall of each arc plate 41. Of course, the arc shape of the arc groove 412 is the same as the arc shape of the arc plate 41. Each arc groove 412 is slidably connected with a sliding seat 4121, and a limiting groove 415 is provided at the bottom of the arc groove 412 along the arc track of the arc groove 412. A sliding part 4122 is provided at the bottom of the sliding seat 4121, and the sliding part 4122 is integrally connected with the sliding seat 4121. The sliding part 4122 can slide in the limiting groove 415, that is, when the sliding seat 4121 slides along the arc groove 412, the sliding seat 4121 drives the sliding part 4122 to slide in the limiting groove 415, and the sliding seat 4121 is limited by the limiting groove 415 to prevent the sliding seat 4121 from detaching from the arc groove 412 during the sliding process.

[0042] In addition, refer to Fig.17 , Fig.19 and Fig.23 A first elastic member 413 is connected between the sliding seat 4121 and one end surface in the arc groove 412, and the first elastic member 413 is a spring. A second elastic member 414 is connected between the sliding seat 4121 and the other end surface in the arc groove 412, and the second elastic member 414 is a spring. A cleaning scraper 410 and a cleaning brush 411 are provided on the outer wall of each arc plate 41. The cleaning scraper 410 extends vertically, which can increase the contact area between the cleaning scraper 410 and the inner wall of the furnace 5, thereby improving the cleaning effect of the cleaning scraper 410.

[0043] Reference Figure 1 , Figure 5 , Figure 6 and Fig. 20 A telescopic rod 42 is connected to the top of the inner wall of each arc-shaped plate 41, and one end of each telescopic rod 42 facing away from each arc-shaped plate 41 is slidably arranged on the outer wall of the lifting end of the lifting mechanism 3 along the circumferential direction of the cylinder 32; the expansion mechanism 40 is arranged at the lifting end of the lifting mechanism 3 and is hinged to each sliding seat 4121. The expansion mechanism 40 rotates and rises and falls with the lifting mechanism 3. The expansion mechanism 40 is used to expand multiple arc-shaped plates 41 so that each cleaning scraper 410 is in contact with the inner wall of the furnace 5.

[0044] The telescopic end 420 of each telescopic rod 42 is connected and fixed to the top of the inner wall of each arc-shaped plate 41, and the end of the fixed end 421 of each telescopic rod 42 is slidably disposed on the outer wall of the lifting end of the lifting mechanism 3 along the circumferential direction of the cylinder 32. Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig. 20, a circular groove 3201 is provided on the outer wall of the solid cylinder 320 along its circumference, and the ends of the fixed ends 421 of each telescopic rod 42 are slidably arranged in the circular groove 3201, so that the fixed ends 421 of each telescopic rod 42 can slide circumferentially relative to the solid cylinder 320, and the fixed ends 421 of each telescopic rod 42 are evenly spaced along the circumference of the cylinder 32. Of course, a third elastic member 425 is connected between the fixed ends 421 of two adjacent telescopic rods 42, and the third elastic member 425 is a spring, which can improve the stability of the telescopic rod 42. The function of the telescopic rod 42 is not to affect the opening of each arc plate 41 by the opening mechanism 40, that is, when the opening mechanism 40 is in the process of opening each arc plate 41, the telescopic rod 42 is in an extended state.

[0045] Reference Fig.15 , Fig.16 , Fig. 20 , a first arc-shaped bar 422 and a second arc-shaped bar 423 are respectively fixed on opposite sides of the fixed end 421 of each telescopic rod 42, the arc shape of the first arc-shaped bar 422 and the second arc-shaped bar 423 is the same as the arc shape of the arc plate 41, and an elastic telescopic block 424 capable of vertical telescopic expansion and contraction is provided on the upper surface of each first arc-shaped bar 422, and the projection of the elastic telescopic block 424 in the radial direction of the stretching mechanism 40 is located within the distance between the two arc-shaped plates 41; in two adjacent telescopic rods 42, the bottom surface of the second arc-shaped bar 423 on one telescopic rod 42 contacts the upper surface of the first arc-shaped bar 422 on the other telescopic rod 42, so that the second arc-shaped bar 423 on one telescopic rod 42 can push the elastic telescopic block 424 on the first arc-shaped bar 422 on the other telescopic rod 42 to retract.

[0046] Reference Fig.16 and Fig. 20 The elastic telescopic block 424 includes a telescopic block body 4241 and a telescopic spring 4242. The upper surface of each first arc strip 422 is provided with a notch 4220. Each telescopic block body 4241 is vertically slidably arranged in each notch 4220. The bottom of the telescopic block body 4241 is connected to the bottom of the notch 4220 through the telescopic spring 4242. The top of the telescopic block body 4241 protrudes out of the notch 4220. In each telescopic rod 42, a guide surface 4243 is provided on the top of the telescopic block body 4241 facing away from the second arc strip 423. In this way, in two adjacent telescopic rods 42, the second arc strip 423 on one telescopic rod 42 is conducive to pushing the elastic telescopic block 424 of the first arc strip 422 on the other telescopic rod 42 to retract.

[0047] In summary, due to the different adsorption degrees of the dirt adhered to the inner wall of the furnace 5, in the process of cleaning the dirt and impurities on the inner wall of the furnace 5, assuming that an arc plate 41 (hereinafter referred to as arc plate A) encounters harder dirt and impurities, and the rotational force of the cleaning scraper 410 on the arc plate A cannot scrape off the harder dirt and impurities, the arc plate A will be in a stationary state due to the resistance of the harder dirt and impurities, but because the sliding seat 4121 on the arc plate A can slide along the arc groove 412 on the arc plate A, and one end of the telescopic rod 42 on the arc plate A is connected to the arc plate A, the other end of the telescopic rod 42 on the arc plate A can slide circumferentially relative to the lifting end of the lifting mechanism 3, so it will not affect the driving unit 2 to drive the lifting mechanism 3 to rotate and drive the opening mechanism 40 to drive other arc plates 41 (other arc plates except the arc plate A) to rotate. Since the first elastic member 413 is connected between one side of the sliding seat 4121 on the arc plate A and one end surface in the arc groove 412 on the arc plate A, and the second elastic member 414 is connected between the other side of the sliding seat 4121 and the other end surface in the arc groove 412 on the arc plate A, assuming that the chamber cleaning assembly 4 rotates counterclockwise, the first elastic member 413 and the second elastic member 414 are sequentially arranged in the counterclockwise direction, and the first arc strip 422 and the second arc strip 423 are also sequentially arranged in the counterclockwise direction, then when the expansion mechanism 40 drives As the other arc plates 41 (other arc plates 41 except arc plate A) continue to rotate, the sliding seat 4121 on the arc plate A will continue to slide in the arc groove 412 on the arc plate A in the counterclockwise direction, so that the first elastic member 413 on the arc plate A is in a compressed state, and the second elastic member 414 on the arc plate A is in a stretched state; and the next arc plate 41 adjacent to the arc plate A (hereinafter referred to as the arc plate B) moves counterclockwise toward the arc plate A. Due to the elastic expansion block 424 in the radial direction of the expansion mechanism 40, the elastic expansion block 424 is in the radial direction of the expansion mechanism 40. The projection is located within the distance between the two arc plates 41. Therefore, before the arc plate B contacts the arc plate A, the second arc strip 423 on the arc plate B will first contact the elastic expansion block 424 of the first arc strip 422 on the arc plate A. When the second arc strip 423 on the arc plate B pushes the elastic expansion block 424 on the first arc strip 422 on the arc plate A to retract, the sliding seat 4121 on the arc plate B forces the second elastic member 414 on the arc plate B to be in a compressed and stored state in a counterclockwise direction, that is, the compression force of the second elastic member 414 The arc plate B is acted on, and because the arc plate B continues to move counterclockwise, the first elastic member 413 on the arc plate B is still in the initial state (uncompressed or unstretched state), so the second elastic force release direction on the arc plate B can only be released counterclockwise, so that the arc plate B hits the arc plate A counterclockwise, so that the cleaning scraper 410 on the arc plate A scrapes off the harder dirt and impurities, so that the cleaning scraper 410 on the arc plate A changes from scraping off dirt and impurities to shoveling off dirt and impurities, thereby ensuring the cleaning effect of the present invention.

[0048] Reference Fig. 9, Fig.11 , 17 , Fig.18 , Fig.19 and Fig. 20 The structure of the spreading mechanism 40 is described in detail below. The spreading mechanism 40 includes a lifting unit 402, a sleeve 401 and a plurality of connecting rods 403. The sleeve 401 is slidably mounted on the outer wall of the lifting end of the lifting mechanism 3. Specifically, it can be understood that the sleeve 401 is slidably mounted on the outer wall of the hollow cylinder 321. Of course, the sleeve 401 rotates with the lifting mechanism 3. Specifically, refer to Figure 7 and Fig.11 The inner wall of the sleeve 401 may be provided with a vertical groove 4011, and the outer wall of the hollow cylinder 321 is provided with a connecting strip 322 that is slidably adapted to the vertical groove 4011, and the connecting strip 322 extends vertically, so that the sleeve 401 can be lifted and lowered with the lifting mechanism 3, and can also be rotated with the lifting mechanism 3. Multiple connecting rods 403 correspond to multiple arc plates 41 one by one, one end of each connecting rod 403 is hinged to the sliding seat 4121 on each arc plate 41, and the other end of each connecting rod 403 is hinged to the outer wall of the sleeve 401. The lifting unit 402 is provided at the lifting end of the lifting mechanism 3, and the lifting end of the lifting unit 402 is drivingly connected to the sleeve 401, and is used to drive the sleeve 401 to slide up and down relative to the lifting mechanism 3 to prop open the multiple arc plates 41.

[0049] Among them, the lifting unit 402 uses an electric cylinder, refer to Figure 6 , Fig.17 The lifting unit 402 is fixed in the hollow cylinder 321, and the lifting end of the lifting unit 402 is connected to the bottom wall of the sleeve 401, and the sleeve 401 is driven to rise and fall relative to the hollow cylinder 321 by the lifting unit 402. When the lifting unit 402 drives the sleeve 401 to descend, each connecting rod 403 opens each curved plate 41, so that the cleaning scraper 410 and the cleaning brush 411 on each curved plate 41 are in close contact with the inner wall of the furnace 5; when the lifting unit 402 drives the sleeve 401 to rise, each connecting rod 403 retracts each curved plate 41, so that the cleaning scraper 410 and the cleaning brush 411 on each curved plate 41 are separated from the inner wall of the furnace 5. The structure of the opening mechanism 40 is similar to the opening mechanism 40 of an umbrella, which can not only quickly open each curved plate 41, but also retract each curved plate 41.

[0050] Based on the above structure, refer to Figure 5 , Figure 6 , Figure 7 The bottom of the expansion mechanism 40 is also provided with an elastic sealing piston 426. Specifically, the elastic sealing piston 426 is fixed to the bottom of the sleeve 401. Fig.12, when the cleaning scraper 410 is not in contact with the inner wall of the furnace 5, the outer wall of the elastic sealing piston 426 is wrapped by the inner wall of the plurality of arc-shaped plates 41; Figure 1 and Fig.23 , when the cleaning scraper 410 is in contact with the inner wall of the furnace 5, the outer wall of the elastic sealing piston 426 is sealed with the inner wall of the furnace 5. That is to say, it can be understood that in the initial state of the cleaning assembly 4 (referring to the state in which each arc plate 41 is in a retracted state, and the cleaning scraper 410 and the cleaning brush 411 on each arc plate 41 are not in contact with the inner wall of the furnace 5), the outer wall of the elastic sealing piston 426 is wrapped by the inner wall of each arc plate 41, that is, the elastic sealing piston 426 is surrounded by multiple arc plates 41 in the space formed by the elastic sealing piston 426, and is embraced by multiple arc plates 41, so that the elastic sealing piston 426 is in a compressed state; refer to Figure 1 , Figure 6 , Fig.23 When the chamber cleaning assembly 4 is in working state (the cleaning scraper 410 is in contact with the inner wall of the furnace 5), the lifting unit 402 drives the sleeve 401 to descend. Since the elastic sealing piston 426 is fixed at the bottom of the sleeve 401, the elastic sealing piston 426 will also descend with the sleeve 401. The sleeve 401 descends to open each connecting rod 403, so that each connecting rod 403 is in a horizontal state, thereby opening each arc plate 41, so that the cleaning scraper 410 and the cleaning brush 411 on each arc plate 41 are in contact with the inner wall of the furnace 5. When each arc plate 41 is stretched open, the elastic sealing piston 426 expands due to its own elastic force. At this time, the outer wall of the elastic sealing piston 426 is sealed against the inner wall of the furnace 5. In this way, dirt and impurities adhering to the inner wall of the furnace 5 are scraped off by the cleaning scrapers 410 and the cleaning brushes 411 and fall onto the elastic sealing piston 426, preventing the cleaning assembly 4 from scraping off dirt and impurities on the inner wall of the furnace 5 and dropping them into the furnace 5.

[0051] In addition, refer to Figure 6 and Figure 7 The elastic sealing piston 426 is a solid truncated cone structure, and the outer diameter of the truncated cone gradually increases from top to bottom, which is conducive to improving the elastic expansion and contraction performance of the elastic sealing piston 426. Of course, an annular groove (not shown) can also be opened on the conical surface of the truncated cone along the circumference of the truncated cone, and the annular groove can further improve the elastic expansion and contraction performance of the elastic sealing piston 426. At the same time, when the cleaning scraper 410 and the cleaning brush 411 are in contact with the inner wall of the furnace 5, the annular groove is located at the periphery of each arc plate 41, so that the dirt and impurities scraped off by the cleaning scraper 410 and the cleaning brush 411 can be concentrated in the annular groove, which plays a role in collecting dirt and impurities.

[0052] The working principle of the furnace cleaning device of the vacuum consumable arc furnace of the present invention is as follows: When the furnace cleaning device of the vacuum consumable arc furnace of the present invention is in use, the mounting seat 1 is moved to the port of the arc furnace that needs to be cleaned by the universal caster 12, and the mounting seat 1 is locked by the self-locking structure on the universal caster 12. At this time, the driving motor 20 drives the active gear 21 to drive the passive gear 22 to rotate, and drives the screw rod 30 to rotate and descend, thereby driving the cleaning assembly 4 in the initial state to rotate and descend to the bottom of the furnace 5. Since the cleaning assembly 4 is in the initial state, the cleaning scrapers 410 and the receiving members on each arc plate 41 do not contact and fit the inner wall of the furnace 5, and the elastic sealing piston 426 does not contact and fit the inner wall of the furnace 5. Therefore, the cleaning assembly 4 can quickly descend to the bottom of the furnace 5, avoiding friction between the cleaning assembly 4 and the inner wall of the furnace 5 during the descent. When the chamber cleaning assembly 4 descends to the designated cleaning area in the furnace 5, the driving unit 2 stops driving, and the lifting unit 402 drives the sleeve 401 to descend relative to the hollow cylinder 321, so that each connecting rod 403 opens each arc plate 41, so that the cleaning scraper 410 and the cleaning brush 411 on the arc plate 41 are in contact with the inner wall of the furnace 5; then, the driving unit 2 drives the screw rod 30 to rotate and rise, driving the chamber cleaning assembly 4 to rotate and rise, thereby driving the cleaning scraper 410 and the cleaning brush 411 on each arc plate 41 to scrape off the dirt and impurities adhering to the inner wall of the furnace 5. In the process of cleaning the dirt and impurities on the inner wall of the furnace 5, refer to Figure 6 , Fig.17 , Fig.18 , Fig.19 and Fig. 20Assuming that an arc plate 41 (hereinafter referred to as arc plate B) encounters harder dirt impurities, and the rotational force of the cleaning scraper 410 on the arc plate B cannot scrape off the harder dirt impurities, the arc plate B will be in a stationary state due to the resistance of the harder dirt impurities, but because the sliding seat 4121 on the arc plate B can slide along the arc groove 412 on the arc plate B, and one end of the telescopic rod 42 on the arc plate B is connected to the arc plate B, the other end of the telescopic rod 42 on the arc plate B can slide circumferentially relative to the solid cylinder 320, so it will not affect the rotation of other arc plates 41 (other arc plates except the arc plate B). Since the first elastic member 413 is connected between one side of the sliding seat 4121 on the arc plate B and one end surface in the arc groove 412 on the arc plate B, and the second elastic member 414 is connected between the other side of the sliding seat 4121 and the other end surface in the arc groove 412 on the arc plate A, assuming that the chamber cleaning assembly 4 rotates counterclockwise, the first elastic member 413 and the second elastic member 414 are sequentially arranged in the counterclockwise direction, and the first arc strip 422 and the second arc strip 423 are also sequentially arranged in the counterclockwise direction, then on the other arc plates 41 As the other arc plates 41 (except the arc plate B) continue to rotate, the sliding seat 4121 on the arc plate B will continue to slide in the arc groove 412 on the arc plate B in the counterclockwise direction, so that the second elastic member 414 on the arc plate B is in a compressed state, and the first elastic member 413 on the arc plate B is in a stretched state; and the next arc plate 41 adjacent to the arc plate B (hereinafter referred to as the arc plate A) moves counterclockwise toward the arc plate B. Since the projection of the elastic telescopic block 424 in the radial direction of the sleeve 401 is located between the two arc plates, Therefore, before the arc plate A contacts the arc plate B, the second arc strip 423 on the arc plate A contacts the elastic expansion block 424 of the first arc strip 422 on the arc plate B first. When the second arc strip 423 on the arc plate A pushes the elastic expansion block 424 on the first arc strip 422 on the arc plate B to retract, the sliding seat 4121 on the arc plate A forces the second elastic member 414 on the arc plate A to be in a compressed and stored state in a counterclockwise direction, that is, the compression force of the second elastic member 414 acts on the arc plate A. As the arc plate A continues to move counterclockwise, the first elastic member 413 on the arc plate A is still in the initial state (uncompressed or unstretched state), so the force release direction of the second elastic member 414 on the arc plate A can only be released counterclockwise, so that the arc plate A hits the arc plate B counterclockwise, so that the cleaning scraper 410 on the arc plate B scrapes off the harder dirt and impurities, so that the cleaning scraper 410 on the arc plate B changes from scraping off dirt and impurities to shoveling off dirt and impurities, thereby ensuring the cleaning effect of the present invention.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A furnace cleaning device for a vacuum consumable arc furnace, comprising a mounting seat, a driving unit, a lifting mechanism and a chamber cleaning assembly, wherein the driving unit is arranged on the mounting seat and is used to drive the lifting mechanism to move up and down, and the lifting end of the lifting mechanism is connected to the chamber cleaning assembly, characterized in that: The chamber cleaning assembly comprises an opening mechanism and a plurality of arc-shaped plates, wherein the plurality of arc-shaped plates are arranged at intervals along the circumference of the lifting end of the lifting mechanism, an arc-shaped groove is opened on the bottom upper edge of the inner wall of each arc-shaped plate in the respective circumferential direction, a sliding seat is slidably connected in each arc-shaped groove, a first elastic member is connected between the sliding seat and one end face in the arc-shaped groove, and a second elastic member is connected between the sliding seat and the other end face in the arc-shaped groove; a cleaning scraper is arranged on the outer wall of each arc-shaped plate; a telescopic rod is connected to the top of the inner wall of each arc-shaped plate, and one end of each telescopic rod facing away from each arc-shaped plate is slidably arranged on the outer wall of the lifting end along the circumference of the lifting end; the opening mechanism is arranged at the lifting end of the lifting mechanism. It is hinged with each sliding seat, and the spreading mechanism rotates with the lifting mechanism to spread out multiple arc plates so that each cleaning scraper is in close contact with the inner wall of the furnace; the first arc bar and the second arc bar are respectively fixed on the opposite sides of the fixed end of each telescopic rod, and the arc shape of the first arc bar and the second arc bar is the same as the arc shape of the arc plate, and an elastic telescopic block that can be telescoped vertically is provided on the upper surface of each first arc bar, and the projection of the elastic telescopic block in the radial direction of the spreading mechanism is located within the spacing between the two arc plates; in two adjacent telescopic rods, the second arc bar on one telescopic rod can push the elastic telescopic block on the first arc bar on the other telescopic rod to retract.

2. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: The spreading mechanism includes a lifting unit, a sleeve and a plurality of connecting rods. The sleeve is slidably mounted on the outer wall of the lifting end of the lifting mechanism, and the sleeve rotates with the lifting mechanism. The plurality of connecting rods correspond to the plurality of arc plates one by one. One end of each connecting rod is hinged to the sliding seat on each arc plate, and the other end of each connecting rod is hinged to the outer wall of the sleeve. The lifting unit is arranged at the lifting end of the lifting mechanism, and the lifting end of the lifting unit is drivingly connected to the sleeve, which is used to drive the sleeve to slide up and down relative to the lifting mechanism to spread the plurality of arc plates.

3. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: An elastic sealing piston is arranged at the bottom of the expansion mechanism. When the cleaning scraper is not in contact with the inner wall of the furnace, the outer wall of the elastic sealing piston is wrapped by the inner walls of a plurality of arc-shaped plates; when the cleaning scraper is in contact with the inner wall of the furnace, the outer wall of the elastic sealing piston is sealed with the inner wall of the furnace.

4. The furnace cleaning device of the vacuum consumable arc furnace according to claim 3 is characterized in that: The elastic sealing piston is a solid truncated cone structure, and the outer diameter of the truncated cone gradually increases from top to bottom.

5. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: A notch is provided on the upper surface of the first arc-shaped strip, and the elastic telescopic block includes a telescopic block body and a telescopic spring. The telescopic block body is vertically slidably arranged in the notch, and the bottom of the telescopic block body is connected to the bottom of the notch through the telescopic spring, and the top of the telescopic block body protrudes out of the notch; in each telescopic rod, a guide surface is provided on the side of the top of the telescopic block body facing away from the second arc-shaped strip.

6. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: A limiting groove is provided at the bottom of the arc groove along the arc track of the arc groove, and a sliding part is provided at the bottom of the sliding seat, and the sliding part can slide in the limiting groove.

7. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: The mounting base includes a connecting plate and two fixed plates, the driving unit is arranged on the connecting plate, the opposite ends of the connecting plate are respectively connected and fixed to the tops of the two fixed plates, the spacing between the two fixed plates is greater than the outer diameter of the furnace, and a universal caster with a self-locking structure is arranged at the bottom of the fixed plate.

8. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: A third elastic member is connected between the fixed ends of two adjacent telescopic rods.

9. The furnace cleaning device of the vacuum consumable arc furnace according to claim 1, characterized in that: The driving unit includes a driving motor, a synchronous belt, a driving gear and a passive gear. The driving motor is arranged on a mounting seat. The output shaft of the driving motor extends vertically and is drivingly connected to the driving gear. The passive gear is rotatably arranged on the mounting seat. The driving gear and the passive gear are connected through the synchronous belt transmission. The passive gear is connected to the lifting mechanism to drive the lifting mechanism to rotate.

10. The furnace cleaning device of the vacuum consumable arc furnace according to claim 9, characterized in that: The lifting mechanism includes a screw and a screw nut. A sliding groove is opened on the outer wall of the screw along its own axial direction. The sliding groove passes through the opposite ends of the screw. A toggle bar is arranged in the center of the passive gear along the axial direction of the passive gear. The screw is passed through the center hole of the passive gear, and the toggle bar is slidably matched with the sliding groove. The screw nut is fixed on the mounting seat. The screw nut is located below the passive gear and is coaxial with the passive gear. The screw nut is threadedly connected to the screw. The lifting speed of the screw is less than the rotation speed of the screw.

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