Locking device and molten metal purification equipment

Abstract

The utility model belongs to the technical field of metal smelting, and discloses a locking device and molten metal purification equipment. The molten metal purification equipment comprises a rotating shaft and a locking device, and a connecting cylinder of the locking device is connected with the rotating shaft. The locking device comprises a rotating rod, a rotor, a connecting cylinder, a clamping sleeve and a locking assembly, the rotating rod is partially arranged in the connecting cylinder in a penetrating mode, the clamping sleeve is arranged outside the connecting cylinder in a sleeving mode, the connecting cylinder and the clamping sleeve are connected through the locking assembly, and a positioning piece on the clamping sleeve is inserted into the connecting cylinder and the rotating rod in the radial direction. The axial fixation of the rotating rod and the connecting cylinder is realized by arranging the locking assembly to stretch out and draw back so as to axially tension; the rotating shaft drives the connecting cylinder and the rotating rod to rotate, so that the rotating rod and the rotor can alternately rotate clockwise and anticlockwise to stir molten metal; the rotating rod is partially arranged in the connecting cylinder in a penetrating manner, and at least two positioning pieces are arranged for fixing and locking from different positions, so that the stability of the rotating rod is improved, and the shaking amplitude of the tail end of the rotating rod is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metal smelting, in particular to a locking device and metal liquid purification equipment. Background Art

[0002] During the refining process of molten metal, due to the influence of the source of metal materials, refining agents, grain refiners and furnace refractory materials, oxidation, alkali metal inclusions or included gases and impurities are likely to appear in the molten metal. It is difficult to eliminate the defects caused by inclusions and gas in subsequent production, making it difficult to ensure the final quality of the product.

[0003] In the prior art, the metal liquid is purified by a rotary degassing refining method, the stirring structure includes a rotating rod and a rotor, the rotor is connected to the rotating rod by a threaded structure, the rotating rod is threadedly connected to a locking device, the locking device is connected to the rotating shaft of the refining equipment, a vent is provided in the rotating rod to input an inert gas, and when the rotating shaft rotates, the rotating rod and the rotor are driven to rotate and stir the metal liquid to remove the gas and impurities contained in the metal liquid. The rotating rod and the locking device are threadedly connected, so that the rotating rod and the locking device cannot rotate alternately clockwise and counterclockwise. When the rotation direction is opposite to the locking direction of the thread, the rotating rod will loosen, the end of the rotating rod will shake greatly, and the contact area at the threaded connection is small and the force is large, so the rotating rod is easy to break when rotating.

[0004] That is, the existing rotating rod is threadedly connected to the locking device, and has the disadvantages of being unable to rotate alternately clockwise and counterclockwise, the end of the rotating rod shaking greatly, and the rotating rod being easily loosened and broken during rotation. Utility Model Content

[0005] The purpose of the utility model is to provide a locking device and a molten metal purification device to solve the problems that the existing rotating rod and the locking device are threadedly connected, such as being unable to rotate alternately clockwise and counterclockwise, the end of the rotating rod shaking greatly, and the rotating rod being easy to loosen and break when rotating.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a locking device, which includes:

[0008] A rotating rod and a rotor connected to the end of the rotating rod, used for stirring the molten metal;

[0009] A connecting cylinder, wherein the rotating rod part is coaxially arranged inside the connecting cylinder, and the connecting cylinder is used to connect the rotating shaft;

[0010] A ferrule, the ferrule is sleeved on the outside of the connecting tube, a positioning piece is provided on the ferrule, at least two positioning pieces are arranged around the circumference of the rotating rod, and the positioning piece is inserted into the connecting tube and the rotating rod in the radial direction;

[0011] The locking assembly has two ends respectively connected to the connecting tube and the ferrule, and the locking assembly can be selectively extended and retracted to axially tighten and fix the rotating rod.

[0012] As an optional technical solution of the locking device, the end of the rotating rod is inserted into the connecting tube to a first preset depth and is axially pressed against the connecting tube.

[0013] As an optional technical solution for a locking device, the clamping sleeve includes a first half clamping ring and a second half clamping ring, the first half clamping ring and the second half clamping ring are connected to form a ring shape to surround the outside of the connecting tube, and the first half clamping ring and the second half clamping ring are connected by fasteners to lock the clamping sleeve to the outside of the connecting tube.

[0014] As an optional technical solution of a locking device, the locking assembly includes:

[0015] A first connecting member, rotatably connected to the connecting cylinder;

[0016] A second connecting member, rotatably connected to the ferrule;

[0017] The third connecting member has two ends threadedly connected to the first connecting member and the second connecting member respectively so that the length of the locking assembly along the axial direction of the rotating rod can be adjusted.

[0018] As an optional technical solution of the locking device, both ends of the third connecting member have threaded sections with opposite rotation directions.

[0019] As an optional technical solution for a locking device, a mounting groove is provided on the connecting tube, and the locking assembly also includes a first pin shaft, which is clamped in the mounting groove and extends along a first direction, and the first connecting piece is sleeved on the first pin shaft and can rotate around the first direction.

[0020] As an optional technical solution for a locking device, a fixing portion is provided on the sleeve, and the locking assembly further includes a second pin shaft, the second pin shaft is passed through the fixing portion and extends along a second direction, and the second connecting piece is sleeved on the second pin shaft and can rotate around the second direction.

[0021] As an optional technical solution of the locking device, the locking device further includes a gas channel for conveying an inert gas, and the gas channel runs through the connecting tube, the rotating rod and the rotor.

[0022] As an optional technical solution for the locking device, a first sealing gasket is provided between the rotating rod and the connecting tube;

[0023] And / or, a second sealing gasket is provided at the top end of the connecting tube to seal the gap between the connecting tube and the rotating shaft.

[0024] The utility model provides a molten metal purification device, which comprises a rotating shaft and the above-mentioned locking device, and a connecting cylinder is connected with the rotating shaft.

[0025] Beneficial effects:

[0026] The utility model provides a locking device, which comprises a rotating rod, a rotor, a connecting tube, a ferrule and a locking assembly. The rotor is connected to the end of the rotating rod, the rotating rod part is coaxially inserted into the interior of the connecting tube, the connecting tube is used to connect the rotating shaft, the ferrule is sleeved on the exterior of the connecting tube, the connecting tube and the ferrule are connected through the locking assembly, the positioning piece on the ferrule is radially inserted into the connecting tube and the rotating rod, and the axial fixation of the rotating rod and the connecting tube is realized by arranging the locking assembly to be telescopic to axially tighten; the connecting tube and the rotating rod are driven to rotate by the rotating shaft, so that the rotating rod and the rotor can stir the molten metal, and can realize clockwise and counterclockwise rotation alternately, effectively avoiding the rotating rod from being loosened or broken during rotation; the rotating rod part is coaxially inserted into the interior of the connecting tube, and at least two positioning pieces are arranged to fix and lock from different positions, so as to improve the stability of the rotating rod and greatly reduce the shaking amplitude of the end of the rotating rod.

[0027] The utility model provides a molten metal purification device, which includes a rotating shaft and a locking device, wherein a connecting tube of the locking device is connected to the rotating shaft. By providing the molten metal purification device with the locking device, the molten metal can be stirred alternately clockwise and counterclockwise, thereby improving the application range of the molten metal purification device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a locking device provided by an embodiment of the utility model;

[0029] Figure 2 is a top view of the locking device provided by an embodiment of the utility model;

[0030] Figure 3 This is a cross-sectional view of the locking device provided by the embodiment of the utility model Figure 1 ;

[0031] Figure 4 This is a cross-sectional view of the locking device provided by the embodiment of the utility model Figure 2 .

[0032] In the figure:

[0033] 10. Rotating rod; 20. Rotor;

[0034] 30. Connecting tube;

[0035] 40, ferrule; 40a, first half of clasp; 40b, second half of clasp; 41, positioning member; 42, fixing portion;

[0036] 50. Locking assembly; 51. First connecting member; 52. Second connecting member; 53. Third connecting member; 54. First pin shaft; 55. Second pin shaft;

[0037] 61. a first sealing gasket; 62. a second sealing gasket;

[0038] 70. Gas channel. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, 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.

[0041] In the present utility model, 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.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] In the prior art, for crucibles or holding furnaces with smaller capacity, a rotating rod with a diameter of 75mm or 95mm is usually used in combination with a rotor with a diameter of less than 250mm for refining. For large holding furnaces, the rotating rod with a diameter of 75mm or 95mm and a rotor with a diameter of less than 250mm will no longer be applicable. The rotating rod is threadedly connected to a locking device, and the locking device is connected to the rotating shaft of the molten metal purification equipment. The weight of a rotating rod with a diameter of 75mm and a length of 1m is about 15kg. Once the weight and length of the rotating rod are lengthened, it is difficult to stably lock it through a threaded connection. For example, a rotating rod with a diameter of 150mm and a length of 2 meters, so it is necessary to provide a locking device that can cooperate with a large-diameter rotating rod and a rotor to be applied to the molten metal refining operation of a large holding furnace to achieve centralized processing and refining of molten metal.

[0044] like Figures 1 to 4 As shown, the utility model provides a locking device and a molten metal purification device, which comprises a rotating shaft and a locking device, wherein a connecting tube 30 of the locking device is connected to the rotating shaft. The locking device comprises a rotating rod 10, a rotor 20, a connecting tube 30, a ferrule 40 and a locking assembly 50, wherein the rotor 20 is connected to the end of the rotating rod 10, and the rotating rod 10 and the rotor 20 are used to stir the molten metal; the rotating rod 10 is partially coaxially arranged inside the connecting tube 30, and the connecting tube 30 is used to connect the rotating shaft; the ferrule 40 is sleeved on the outside of the connecting tube 30, and a positioning member 41 is provided on the ferrule 40, wherein at least two positioning members 41 are arranged around the circumference of the rotating rod 10, and the positioning members 41 are inserted radially into the connecting tube 30 and the rotating rod 10; the two ends of the locking assembly 50 are respectively connected to the connecting tube 30 and the ferrule 40, and the locking assembly 50 can be selectively extended and retracted to tighten and fix the rotating rod 10 axially.

[0045] The locking assembly 50 is set to be telescopic to axially tighten the rotating rod 10 and the connecting tube 30 to achieve axial fixation; the connecting tube 30 and the rotating rod 10 are driven to rotate by the rotating shaft, so that the rotating rod 10 and the rotor 20 can stir the molten metal, and can achieve clockwise and counterclockwise rotation, effectively avoiding the loosening or breaking of the rotating rod 10 during rotation; by setting the rotating rod 10 partly coaxially through the interior of the connecting tube 30, and setting at least two positioning members 41 to fix and lock from different positions, the stability of the rotating rod 10 is improved, and the shaking amplitude of the end of the rotating rod 10 is greatly reduced. By setting the molten metal purification equipment with a locking device, the molten metal can be stirred alternately clockwise and counterclockwise, which improves the application range of the molten metal purification equipment.

[0046] In this embodiment, the connecting tube 30 is connected to the rotating shaft by bolts; the top surface of the connecting tube 30 is provided with a boss for docking and positioning with the rotating shaft; the rotating rod 10 and the rotor 20 are both made of graphite material; the molten metal is molten aluminum; the rotor 20 is connected to the end of the rotating rod 10 by a threaded structure, and the top part of the rotating rod 10 is penetrated into the interior of the connecting tube 30; the locking device also includes a gas channel 70 for conveying inert gas, and the gas channel 70 passes through the connecting tube 30, the rotating rod 10 and the rotor 20. By setting the gas channel 70, the inert gas is conveyed and blown into the molten metal to form fine bubbles, so that the gas and impurities dissolved in the molten metal contact with the bubbles, and the gas and impurities are taken out through the bubbles. In other embodiments, the molten metal may also be copper liquid or magnesium liquid, and the specific type of the molten metal is not limited.

[0047] In order to prevent the inert gas from leaking from the gap of the locking device, a first sealing gasket 61 is provided between the rotating rod 10 and the connecting cylinder 30; a second sealing gasket 62 is provided at the top of the connecting cylinder 30 to close the gap between the connecting cylinder 30 and the rotating shaft. By providing the first sealing gasket 61 and the second sealing gasket 62, the connection between the rotating rod 10 and the connecting cylinder 30 and the connection between the connecting cylinder 30 and the rotating shaft are kept sealed, effectively preventing the inert gas from leaking from the gap and affecting the degassing and refining of the molten metal. Preferably, the first sealing gasket 61 and the second sealing gasket 62 are both annular.

[0048] See also Figure 3 , the top of the rotating rod 10 is coaxially inserted into the connecting tube 30 at a first preset depth, and the top of the rotating rod 10 is axially pressed against the connecting tube 30. By setting the rotating rod 10 to be inserted into the connecting tube 30 at the first preset depth, the rotating rod 10 is partially wrapped in the connecting tube 30, the contact area at the matching point between the rotating rod 10 and the connecting tube 30 is increased, the stability of the fixing of the rotating rod 10 is improved, and the shaking amplitude of the end of the rotating rod 10 is reduced. Preferably, the first preset depth is at least one fifth of the length of the rotating rod 10.

[0049] In order to ensure that the positioning member 41 can be stably inserted into the connecting tube 30 and the rotating rod 10, the positioning member 41 and the ferrule 40 are integrated, the connecting tube 30 is provided with an insertion hole, and the rotating rod 10 is provided with an insertion groove, and the positioning member 41 can pass through the insertion hole and be inserted into the insertion groove. Specifically, the positioning member 41 is welded to the ferrule 40; when the ferrule 40 is sleeved on the outside of the connecting tube 30, it is positioned through the insertion hole on the connecting tube 30, so that the ferrule 40 is installed and ensures that the positioning member 41 is inserted into the connecting tube 30 and the rotating rod 10 after the ferrule 40 is installed.

[0050] In order to realize the installation of the ferrule 40 and the positioning member 41, the ferrule 40 includes a first half ferrule 40a and a second half ferrule 40b. The first half ferrule 40a and the second half ferrule 40b are connected to form a ring to surround the outside of the connecting tube 30. The first half ferrule 40a and the second half ferrule 40b are connected by fasteners to lock the ferrule 40 to the outside of the connecting tube 30.

[0051] Specifically, a positioning member 41 is provided on the first half of the clamping ring 40a and the second half of the clamping ring 40b; the positioning member 41 is inserted into the connecting tube 30 and the rotating rod 10, so as to fix the first half of the clamping ring 40a and the second half of the clamping ring 40b on the connecting tube 30; the first half of the clamping ring 40a and the second half of the clamping ring 40b are connected by fasteners to form a ring shape, thereby radially locking the connecting tube 30.

[0052] In this embodiment, two positioning members 41 are arranged at intervals on the inner sides of the first half retaining ring 40 a and the second half retaining ring 40 b . The four positioning members 41 are evenly spaced along the circumference of the ferrule 40 , and the positioning members 41 extend along the radial direction of the ferrule 40 .

[0053] In other embodiments, the ferrule 40 and the positioning piece 41 may also be provided separately, the ferrule 40 is sleeved on the outside of the connecting tube 30, and then the positioning piece 41 is inserted into the ferrule 40, the connecting tube 30 and the rotating rod 10 in sequence, and the positioning piece 41 is welded to the ferrule 40.

[0054] In this embodiment, two sets of locking assemblies 50 are respectively connected to the first half of the snap ring 40a and the second half of the snap ring 40b. In other embodiments, multiple arc snap rings can be connected end to end to form the sleeve 40, and the locking assemblies 50 are at least arranged one by one with the arc snap rings.

[0055] See also Figure 1 and Figure 3 The locking assembly 50 includes a first connecting member 51, a second connecting member 52 and a third connecting member 53. The first connecting member 51 is rotatably connected to the connecting cylinder 30, the second connecting member 52 is rotatably connected to the ferrule 40, and the two ends of the third connecting member 53 are respectively threadedly connected to the first connecting member 51 and the second connecting member 52, so that the length of the locking assembly 50 along the axis direction of the rotating rod 10 can be adjusted. By providing the third connecting member 53 that can be threadedly connected to the first connecting member 51 and the second connecting member 52, tightening the third connecting member 53 shortens the length of the locking assembly 50 along the axis direction of the rotating rod 10, so as to axially tighten the connecting cylinder 30 and the ferrule 40, and the rotating rod 10 is pressed against the connecting cylinder 30 by the locating member 41 under the action of the axial tightening force; when the locking assembly 50 needs to be disassembled, the third connecting member 53 can be loosened. In this embodiment, the locking assembly 50 is provided with two groups, and the two groups of locking assemblies 50 are relatively arranged at the positions outside the connecting cylinder 30. In other embodiments, the locking assembly 50 can be provided with multiple groups.

[0056] Preferably, the two ends of the third connecting member 53 have thread segments with opposite rotation directions. By setting the thread segments at the two ends of the third connecting member 53 to have opposite rotation directions, when the third connecting member 53 is rotated, the first connecting member 51 and the second connecting member 52 can be tightened or loosened at the same time. In this embodiment, the first connecting member 51 and the second connecting member 52 are both movable bolts, the thread rotation directions of the first connecting member 51 and the second connecting member 52 are opposite, and the third connecting member 53 is a long hexagonal nut.

[0057] See also Figure 2 In order to rotatably connect the first connecting member 51 to the connecting tube 30, a mounting groove is provided on the connecting tube 30, and the locking assembly 50 further includes a first pin shaft 54, which is clamped in the mounting groove and extends along the first direction. The first connecting member 51 is sleeved on the first pin shaft 54 ​​and can rotate around the first direction. By providing the mounting groove on the connecting tube 30 and arranging the first pin shaft 54 ​​in the mounting groove, the first connecting member 51 is rotatably arranged on the connecting tube 30, the structure is simple and easy to disassemble and assemble, and the first connecting member 51 can rotate around the first direction when it is separated from the third connecting member 53.

[0058] See also Figure 4 In order to rotatably connect the second connecting member 52 to the ferrule 40, the first half clasp 40a and the second half clasp 40b are both provided with a fixing portion 42, and the locking assembly 50 further includes a second pin 55, the second pin 55 is penetrated through the fixing portion 42 and extends along the second direction, and the second connecting member 52 is sleeved on the second pin 55 and can rotate around the second direction. By providing the second pin 55, it is possible to ensure that the second connecting member 52 rotates around the second direction, with high reliability and convenient assembly and disassembly. In this embodiment, the second pin 55 is penetrated through the fixing portion 42, and is fixed by a cotter pin to prevent the second pin 55 from falling out of the fixing portion 42; the first direction is the same as the second direction, and the first direction and the second direction are both perpendicular to the axial direction of the rotating rod 10.

[0059] The following is the specific installation and use process of the locking device:

[0060] First, use a tool to loosen the third connecting member 53 of each locking assembly 50, and then remove all the first connecting members 51 and the second connecting members 52 to remove the first half of the retaining ring 40a and the second half of the retaining ring 40b; set the first sealing gasket 61 at the top of the rotating rod 10, and install the rotating rod 10 with the first sealing gasket 61 into the connecting tube 30, so that the two sides of the first sealing gasket 61 are respectively attached to the rotating rod 10 and the connecting tube 30; thread the rotor 20 to the end of the rotating rod 10.

[0061] Then, the first half snap ring 40a and the second half snap ring 40b are put on the outside of the connecting tube 30, ensuring that the position of the insertion groove on the rotating rod 10 corresponds to the position of the positioning member 41, so that the positioning member 41 passes through the insertion through hole of the connecting tube 30 and is inserted into the insertion groove of the rotating rod 10; the first half snap ring 40a and the second half snap ring 40b are connected by fasteners to be locked and fixed in the radial direction. The first pin 54 is clamped in the installation groove of the connecting tube 30 and is rotatably connected to the first connecting member 51 to fix the first connecting member 51, and the second pin 55 is passed through the fixing portion 42 and is rotatably connected to the second connecting member 52 to fix the second connecting member 52.

[0062] Finally, install the third connecting member 53 and tighten it with a tool to ensure that the first connecting member 51 and the second connecting member 52 can be pulled during the process of tightening the third connecting member 53. The locking assembly 50 can be locked in the axial direction after being tightened up and down, so that the positioning member 41 can clamp the rotating rod 10, ensuring that the rotating rod 10 is fixed and locked without loosening.

[0063] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A locking device, characterized in that: include: A rotating rod (10) and a rotor (20) connected to the end of the rotating rod (10), used for stirring the molten metal; A connecting tube (30), wherein the rotating rod (10) is partially coaxially arranged inside the connecting tube (30), and the connecting tube (30) is used to connect the rotating shaft; a ferrule (40), the ferrule (40) being sleeved on the outside of the connecting tube (30), the ferrule (40) being provided with a positioning piece (41), at least two positioning pieces (41) being provided around the circumference of the rotating rod (10), and the positioning pieces (41) being inserted into the connecting tube (30) and the rotating rod (10) in a radial direction; A locking assembly (50) has two ends respectively connected to the connecting tube (30) and the clamping sleeve (40), and the locking assembly (50) can be selectively extended and retracted to axially tighten and fix the rotating rod (10).

2. The locking device according to claim 1, characterized in that: The end of the rotating rod (10) is inserted into the connecting tube (30) at a first preset depth and is tightly pressed against the connecting tube (30) along the axial direction.

3. The locking device according to claim 1, characterized in that: The ferrule (40) comprises a first half ferrule (40a) and a second half ferrule (40b); the first half ferrule (40a) and the second half ferrule (40b) are connected to form a ring so as to surround the outside of the connecting tube (30); the first half ferrule (40a) and the second half ferrule (40b) are connected by a fastener so as to lock the ferrule (40) to the outside of the connecting tube (30).

4. The locking device according to claim 1, characterized in that: The locking assembly (50) comprises: A first connecting member (51) rotatably connected to the connecting tube (30); A second connecting member (52) rotatably connected to the ferrule (40); The third connecting member (53) has two ends respectively threadedly connected to the first connecting member (51) and the second connecting member (52) so that the length of the locking assembly (50) along the axis direction of the rotating rod (10) can be adjusted.

5. The locking device according to claim 4, characterized in that: The two ends of the third connecting member (53) have threaded sections with opposite rotation directions.

6. The locking device according to claim 4, characterized in that: The connecting tube (30) is provided with a mounting groove, and the locking assembly (50) further comprises a first pin shaft (54), the first pin shaft (54) is clamped in the mounting groove and extends along a first direction, and the first connecting member (51) is sleeved on the first pin shaft (54) and can rotate around the first direction.

7. The locking device according to claim 4, characterized in that: The clamping sleeve (40) is provided with a fixing portion (42), and the locking assembly (50) further includes a second pin shaft (55), the second pin shaft (55) is passed through the fixing portion (42) and extends along a second direction, and the second connecting member (52) is sleeved on the second pin shaft (55) and can rotate around the second direction.

8. The locking device according to any one of claims 1 to 7, characterized in that: The locking device further comprises a gas channel (70) for conveying an inert gas, wherein the gas channel (70) passes through the connecting cylinder (30), the rotating rod (10) and the rotor (20).

9. The locking device according to any one of claims 1 to 7, characterized in that: A first sealing gasket (61) is provided between the rotating rod (10) and the connecting tube (30); And / or, a second sealing gasket (62) is provided at the top end of the connecting tube (30) to seal the gap between the connecting tube (30) and the rotating shaft.

10. Metal liquid purification equipment, characterized in that: It comprises a rotating shaft and a locking device as claimed in any one of claims 1 to 9, wherein the connecting cylinder (30) is connected to the rotating shaft.

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