A welding torch cleaning device

Abstract

This application relates to a welding torch cleaning device, belonging to the technical field of welding equipment. It includes a base, on which a positioning block is rotatably connected. The upper end face of the positioning block has a positioning groove for inserting a welding torch nozzle, and the lower end of the positioning block has a receiving groove. The upper end of the positioning block also has a positioning hole for inserting a tungsten needle of the welding torch. The positioning hole is located at the center of the positioning groove and communicates with the receiving groove. A sleeve coaxial with the positioning hole is provided within the positioning groove. The sleeve is inserted into the nozzle. Multiple inner scrapers, evenly distributed around the center line of the positioning hole, are provided on the inner wall of the sleeve. The inner scrapers abut against the side wall of the tungsten needle. A driving component for rotating the positioning block is provided on the base. This application effectively cleans welding residue adhering to the inside of a high-speed welding torch, improving welding quality.

Description

Technical Field

[0001] This application relates to the field of welding equipment, and more particularly to a welding torch cleaning device. Background Technology

[0002] Welding, also known as fusion welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature, or high pressure. Argon arc welding (argon arc welding) is a welding technique that uses argon gas as a shielding gas; it is also called argon gas shielded welding. Argon arc welding involves a tungsten needle and a nozzle surrounding the needle. Argon gas is channeled through the nozzle and surrounds the needle, thus isolating air from the weld area and preventing oxidation.

[0003] Regarding the aforementioned technologies, during the welding process, the weldment may adhere to the tungsten needle, causing poor flow of the welding shielding gas and resulting in welding defects such as porosity. Summary of the Invention

[0004] The purpose of this application is to provide a welding torch cleaning device for cleaning welding materials adhering to the inside of the welding torch, thereby improving welding quality.

[0005] A welding torch cleaning device includes a base, on which a positioning block is rotatably connected. The upper end face of the positioning block has a positioning groove for inserting a welding torch nozzle, and the lower end of the positioning block has a receiving groove. The upper end of the positioning block also has a positioning hole for inserting a tungsten needle of the welding torch. The positioning hole is located at the center of the positioning groove and communicates with the receiving groove. A sleeve coaxial with the positioning hole is provided inside the positioning groove. The sleeve is inserted into the nozzle. Multiple inner scrapers evenly distributed around the center line of the positioning hole are provided on the inner wall of the sleeve. The inner scrapers abut against the side wall of the tungsten needle. The base is provided with a driving component for rotating the positioning block.

[0006] By adopting the above technical solution, when the nozzle is inserted into the positioning groove, the tungsten needle is simultaneously inserted into the sleeve. The driving component drives the positioning block to rotate, and the inner scraper inside the sleeve cuts and removes the weld on the tungsten needle. The removed waste enters the collection groove along the positioning hole, so that the waste is collected quickly and centrally. At the same time, multiple evenly distributed inner scrapers can position and support the tungsten needle, reduce the shaking of the tungsten needle when the waste is removed, and improve the stability of the tungsten needle. This allows for the rapid removal of weld inside the welding torch, reduces the impact on the shielding gas, and improves the welding quality.

[0007] Optionally, each of the inner scrapers is spirally distributed on the inner wall of the sleeve.

[0008] By adopting the above technical solution, the inner scraper can be inclined to cut into and shear the welded material along the spiral direction, reducing the obstruction of the welded material to the inner scraper and improving the efficiency and stability of waste removal.

[0009] Optionally, a receiving groove is provided on the outer wall of the sleeve, and an outer scraper that slides in a direction perpendicular to the axis of the sleeve is slidably connected in the receiving groove. The sleeve is provided with a control mechanism to control the movement of the outer scraper.

[0010] By adopting the above technical solution, when the sleeve is located outside the nozzle, the control mechanism controls the outer scraper to be housed in the receiving groove. When the sleeve is located inside the nozzle, the control mechanism controls the position of the outer scraper so that the outer scraper abuts against the inner wall of the nozzle and removes the welding material inside the nozzle as the sleeve rotates. This overcomes the problem of difficulty in cleaning the welding material inside the nozzle due to its shape and improves the convenience of cleaning the nozzle.

[0011] Optionally, the control mechanism includes a return spring, one end of which is fixed to the side of the outer scraper near the sleeve axis, and the other end is fixed inside the sleeve. When the return spring is in the normal state, the outer scraper is inserted into the receiving groove. The control mechanism also includes a limiting component to restrict the movement of the outer scraper.

[0012] By adopting the above technical solution, when the sleeve rotates, the outer scraper moves away from the sleeve axis under the action of centrifugal force. At this time, the return spring is stretched until it abuts against the inner wall of the nozzle and removes the welded material. When the sleeve stops rotating, the return spring returns to its original state, so that the outer scraper is pulled back into the receiving groove again, so that the outer scraper can be automatically stored and the sleeve can be quickly separated from the nozzle, improving the cleaning efficiency.

[0013] Optionally, the limiting component includes a rack fixed to the outer scraper, a pawl engaged on the rack, the pawl being rotatably connected to a sleeve, and a torsion spring between the pawl and the sleeve driving the pawl to engage with the rack. A control rod parallel to the sleeve axis is provided on one side of the pawl, the control rod being slidably connected to the sleeve. One end of the control rod extends through the top of the sleeve and is fixedly connected to a connecting ring. A washer is rotatably connected to the side of the connecting ring away from the sleeve. A support spring for connecting the sleeve is provided at the other end of the control rod. A waist-shaped hole is provided on the control rod. A lever is provided on the pawl, the end of the lever away from the pawl being inserted into the waist-shaped hole. When the connecting ring abuts against the sleeve, the pawl engages with the rack. When the connecting ring moves away from the sleeve, the control rod drives the lever to rotate through the wall of the waist-shaped hole, disengaging the pawl from the rack.

[0014] By adopting the above technical solution, when the washer has not yet contacted the bottom of the nozzle, the control rod moves upward under the action of the support spring, causing the control rod to drive one end of the actuating rod to move upward through the waist-shaped hole, thereby driving the pawl to disengage from the rack. At this time, the outer scraper can reciprocate in a direction perpendicular to the sleeve axis. When the sleeve squeezes the connecting ring and the washer at the bottom of the nozzle, the control rod moves downward relative to the sleeve, so that the control rod does not limit the actuating rod. Thus, the pawl can engage with the rack through the torsion spring. The outer scraper, which is fixedly connected to the rack, can only move in a direction away from the sleeve axis until it abuts against the inner wall of the nozzle. Thus, when the outer scraper abuts against the inner wall of the nozzle, the position of the outer scraper is locked. Therefore, the outer scraper will not be squeezed by the weld and retract into the receiving groove, improving the effect of the outer scraper in removing the weld.

[0015] Optionally, a baffle is provided at the opening of the receiving groove. The baffle is inserted into the sleeve and slidably connected to the sleeve. A moving block is provided on one side of the baffle inside the sleeve. A driving block is provided on the control rod that abuts against the moving block and is used to drive the baffle to block the opening of the receiving groove. A connecting spring is provided between the baffle and the sleeve.

[0016] By adopting the above technical solution, when the connecting ring and the sleeve are far apart, the support spring drives the control rod to move upward, the drive block drives the moving block to move, and the moving block moves the baffle to the opening of the receiving groove, thereby blocking the receiving groove. At this time, the connecting spring deforms. When the connecting ring and the sleeve abut, the moving block returns to its original position, the connecting spring restores its deformation, thereby driving the baffle to open the receiving groove, so that the outer scraper can slide out of the receiving groove.

[0017] Optionally, a shearing assembly is provided at one end of the positioning hole near the storage slot. The shearing assembly includes multiple shearing blades around the center line of the positioning hole. The shearing blades are inclined. One end of the shearing blade is inserted into the sleeve and is slidably connected to the sleeve along the inclined direction of the shearing blade. The other end of the shearing blade is inclined downward. A pressure plate is slidably connected to one end of the shearing blade inside the sleeve. The pressure plate is fixed on the control rod.

[0018] By adopting the above technical solution, when the connecting ring and the sleeve abut, the control rod moves downward, the pressure plate moves downward, and the shearing blade can slide and connect with the pressure plate, thereby driving the shearing blade to extend out of the sleeve in its inclined direction. The end of the tungsten needle gradually retracts, and the shearing blade can clean up the waste along the side wall of the end of the tungsten needle. When it is necessary to cut the tungsten needle, the shearing blade can also cut the tungsten needle and make the end of the tungsten needle needle needle-shaped.

[0019] Optionally, the connecting ring has an oil storage cavity inside, and both the inner and outer side walls of the connecting ring are provided with oil drain holes that connect the oil storage cavity to the outside. The oil drain holes are located at the upper end of the oil storage cavity.

[0020] By adopting the above technical solution, when the connecting ring rotates with the sleeve, the oil in the oil storage chamber moves away from the axis of the connecting ring under the action of centrifugal force. As the oil accumulates on one side of the oil storage chamber, the oil level rises, so that it can be thrown out through the oil drain hole, thereby reducing the damage to the welding torch when cleaning the welded material.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. The internal cutting blade can quickly remove welding material from the tungsten needle, allowing the tungsten needle to be reused multiple times and extending its service life;

[0023] 2. The external cutting blade can quickly clean the inner wall of the nozzle, improving the cleaning efficiency of the nozzle;

[0024] 3. The shearing blade can not only clean the tip of the tungsten needle, but also cut the tungsten needle and keep it in needle shape, thus maintaining the welding quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the sleeve structure in an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the structure of the limiting component in the embodiments of this application;

[0028] Figure 4 This is a schematic diagram of the control lever structure in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the shearing component in an embodiment of this application;

[0030] In the diagram, 1. Base; 2. Positioning block; 21. Positioning groove; 22. Storage groove; 23. Positioning hole; 3. Driving component; 4. Sleeve; 41. Inner cutter; 42. Outer cutter; 43. Receiving groove; 44. Positioning rod; 5. Control mechanism; 51. Return spring; 52. Limiting component; 521. Rack; 522. Pawl; 523. Control rod; 524. Waist-shaped hole; 525. Actuating rod; 526. Driving block; 527. Support spring; 528. Connecting ring; 5281. Oil storage chamber; 5282. Oil drain hole; 529. Washer; 53. Baffle; 54. Moving block; 6. Shearing component; 61. Pressure plate; 62. Shearing blade. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0032] Example 1: A welding torch cleaning device, referring to Figure 1 It includes a base 1, a positioning block 2 rotatably connected above the base 1, and a driving component 3 for driving the rotation of the positioning block 2 on the base 1. The driving component 3 includes a drive motor mounted on the base 1, a bevel gear fixedly connected to the output shaft of the drive motor, and a coaxial bevel gear fixedly connected to the outside of the positioning block 2. The two bevel gears mesh and transmit power.

[0033] The upper surface of the positioning block 2 has a positioning groove 21, into which the nozzle of the welding torch is inserted and fitted. The lower end of the positioning block 2 has a receiving groove 22. The positioning block 2 also has a positioning hole 23 whose axis coincides with the rotation axis of the positioning block 2. The positioning hole 23 is directly opposite the tungsten needle inside the nozzle and connects the positioning groove 21 and the receiving groove 22. A sleeve 4 is integrally formed vertically inside the positioning hole 23. One end of the sleeve 4 is located in the positioning groove 21. The tungsten needle is coaxially arranged with the sleeve 4 and is inserted into the sleeve 4.

[0034] Reference Figure 1 and Figure 2 Multiple internal cutting blades 41, evenly distributed around the axis of the sleeve 4, are fixedly connected to the inner wall of the sleeve 4. Each internal cutting blade 41 can be set vertically or spirally distributed. When the tungsten needle enters the sleeve 4, the internal cutting blades 41 abut against the side wall of the tungsten needle. The drive motor drives the positioning block 2 to rotate through the bevel gear. The positioning block 2 drives the sleeve 4 to rotate, and the internal cutting blades 41 on the inner side of the sleeve 4 rotate to remove the welding material on the tungsten needle.

[0035] Reference Figure 1 and Figure 2 In order to quickly remove the welding material on the inner wall of the nozzle, three receiving grooves 43 are evenly distributed around the axis of the sleeve 4 on the outer wall of the sleeve 4. An outer scraper that moves in a direction perpendicular to the axis of the sleeve 4 is slidably connected in the receiving grooves 43. The sleeve 4 is also provided with a control mechanism 5 for controlling the position of the outer scraper.

[0036] Reference Figure 2 and Figure 3 A positioning rod 44, parallel to the moving direction of the outer scraper, is inserted into one end of the outer scraper near the axis of the sleeve 4. The positioning rod 44 is slidably connected to one end of the outer scraper, and the other end is fixed to the side wall of the receiving groove 43 away from the groove opening. The control mechanism 5 includes a return spring 51 sleeved on the positioning rod 44. One end of the return spring 51 is fixed to the outer scraper, and the other end is fixed to the sleeve 4. The control mechanism 5 also includes a limiting component 52 for limiting the moving direction of the outer scraper.

[0037] The limiting component 52 includes a rack 521 fixed on the outer scraper, a pawl 522 engaged on the rack 521, one end of the pawl 522 away from the rack 521 located in the receiving groove 43 and rotatably connected to the sleeve 4, and a torsion spring connecting the pawl 522 and the sleeve 4 is provided between the two, the torsion spring drives the pawl 522 to engage on the rack 521, when the pawl 522 engages on the rack 521, the rack 521 and the outer scraper can only move in a direction away from the axis of the sleeve 4.

[0038] Reference Figure 3 and Figure 4 A control rod 523 parallel to the axis of the sleeve 4 is provided on one side of the pawl 522. The control rod 523 is inserted into and slides on the cylinder of the sleeve 4. A waist-shaped hole 524 is opened on the control rod 523. A toggle rod 525 is inserted into the waist-shaped hole 524. The end of the toggle rod 525 away from the waist-shaped hole 524 is fixed to the side wall of the pawl 522, and the toggle rod 525 is located between the rotation point of the pawl 522 and the rack 521. A drive block 526 is fixedly connected to the toggle rod 525. A sliding groove is provided in the sleeve 4. The drive block 526 is slidably connected in the sliding groove. A support spring 527 is fixedly connected to the drive block 526. The support spring 527 is sleeved on the control rod 523. The end of the support spring 527 away from the drive rod is fixed to the sleeve 4.

[0039] Reference Figure 2 and Figure 4 The upper end of the control lever 523 extends out of the sleeve 4. The ends of the three control levers 523 are fixedly connected to the same connecting ring 528. A washer 529 is rotatably connected to the side of the connecting ring 528 away from the sleeve 4. The support spring 527 drives the control lever 523 to move in the direction of sliding out of the sleeve 4 until the drive block 526 abuts against the end of the slide groove. At this time, there is a certain distance between the connecting ring 528 and the sleeve 4.

[0040] When there is a certain distance between the connecting ring 528 and the sleeve 4, the control rod 523 is kept in the state of passing through the sleeve 4 under the action of the support spring 527. At this time, the lower side wall of the waist-shaped hole 524 abuts against the actuating rod 525 and applies an upward supporting force to the actuating rod 525. Thus, the pawl 522 is disengaged from the rack 521 by the actuating rod 525, that is, the rack 521 is separated from the pawl 522. At this time, the outer scraper can move forward and backward in a direction perpendicular to the axis of the sleeve 4.

[0041] When the sleeve 4 is inserted into the nozzle, the washer 529 first abuts against the bottom wall inside the nozzle. Then the sleeve 4 continues to move towards the inside of the nozzle until it abuts against the connecting ring 528. At this time, the support spring 527 is compressed, the control rod 523 slides down, the oblong hole 524 moves down, and the pawl 522 engages with the rack 521 again under the action of the torsion spring. At the same time, the upper side wall of the oblong hole 524 does not contact the actuating rod 525. Then the sleeve 4 rotates, and the outer scraper overcomes the resistance of the return spring 51 under the action of centrifugal force and moves towards the inner wall of the nozzle. The cooperation between the pawl 522 and the rack 521 prevents the outer scraper from moving in the opposite direction, thereby supporting the outer scraper to overcome the resistance of scraping the welded material inside the nozzle.

[0042] When the sleeve 4 needs to detach from the nozzle, the size of the outer scraper allows the nozzle to move upward a certain distance. The support spring 527 drives the control rod 523 to rise, thereby causing the pawl 522 to disengage from the rack 521. When the sleeve 4 stops rotating, the return spring 51 pulls the outer scraper and rack 521 back into the receiving groove 43, so that the sleeve 4 can completely detach from the nozzle.

[0043] A baffle 53 is also provided at the opening of the receiving groove 43 to prevent the outer scraper from entering the receiving groove 43. A plug-in groove is provided on the side wall of the receiving groove 43 near the control rod 523. One side of the baffle 53 is inserted into the plug-in groove and is slidably connected to the sleeve 4. A moving block 54 is fixedly connected to one end of the baffle 53 located in the plug-in groove. The side of the moving block 54 away from the baffle 53 abuts against the drive block 526. The abutting surfaces of the moving block 54 and the drive block 526 are both set as inclined surfaces. A connecting spring is also provided in the plug-in groove. One end of the connecting spring is fixed to the baffle 53 and the other end is fixed to the sleeve 4. The connection is not shown in the figure.

[0044] When the control lever 523 rises, i.e., when the connecting ring 528 and the sleeve 4 separate, the drive block 526 pushes the moving block 54 closer to the receiving groove 43 and overcomes the resistance of the connecting spring until the baffle 53 slides into the groove of the receiving groove 43. During this process, the outer scraper has completely entered the receiving groove 43. When the control lever 523 falls, i.e. when the connecting ring 528 and the sleeve 4 abut, the drive block 526 returns to its original position, and the connecting spring pushes the moving block 54 away from the receiving groove 43 until the baffle 53 completely enters the insertion groove. Then the outer scraper can slide out of the receiving groove 43.

[0045] Reference Figure 4 and Figure 5A shearing assembly 6 is provided on the side of the positioning hole 23 near the receiving groove 22. The shearing assembly 6 includes a pressure plate 61 fixedly connected to the lower end of the connecting rod. The pressure plate 61 is located inside the cylinder of the sleeve 4 and is slidably connected to the cylinder of the sleeve 4. The pressure plate 61 is inclined. A shearing blade 62 is provided on the side of the pressure plate 61 near the receiving groove 43. One end of the shearing blade 62 is dovetail-shaped. A dovetail groove is opened on the side of the pressure plate 61 near the receiving groove 43. The shearing blade 62 is inserted into the dovetail groove so that it is slidably connected to the pressure plate 61 and does not separate. The dovetail-shaped end of the shearing blade 62 and the dovetail groove are not shown in the figure. The other end of the shearing blade 62 passes through the sleeve 4 and is slidably connected to the sleeve 4. The shearing blade 62 is inclined, and the inclination direction of the shearing blade 62 is consistent with the side wall of the tungsten needle tip.

[0046] When the control lever 523 descends, the pressure plate 61 pushes the shearing blade 62 out of the sleeve 4, thereby cleaning the tip of the tungsten needle. When the control lever 523 rises, the pressure plate 61 again drives the shearing blade 62 back into the sleeve 4.

[0047] Reference Figure 1 and Figure 5 To improve the effectiveness of removing welded material, an oil storage cavity 5281 for storing oil is provided inside the connecting ring 528. Multiple oil drain holes 5282 are provided on both the inner and outer sides of the connecting ring 528, evenly spaced around the axis of the connecting ring 528. The oil drain holes 5282 connect the upper end of the oil storage cavity 5281 to the outside. When the connecting ring 528 rotates, the oil in the oil storage cavity 5281 is thrown out through the oil drain holes 5282, which facilitates the removal of welded material by the inner and outer scrapers.

[0048] The implementation principle of this application embodiment is as follows: When the nozzle is inserted into the positioning groove 21, the connecting ring 528 and the sleeve 4 abut against each other. At this time, the baffle 53 disengages from the receiving groove 43, the drive motor drives the positioning block 2 to rotate, the inner cutting blade 41 scrapes off the welding on the tungsten needle, and the outer scraper slides out of the receiving groove 43 to remove the welding on the inner wall of the nozzle. After the cleaning is completed, the sleeve 4 stops rotating, the nozzle rises, and the outer scraper is pulled back to the receiving groove 43 by the return spring 51. At the same time, the baffle 53 gradually slides into the receiving groove 43, thereby sealing the receiving groove 43 again.

[0049] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding torch cleaning device, characterized in that, The device includes a base (1), on which a positioning block (2) is rotatably connected. The upper end face of the positioning block (2) is provided with a positioning groove (21) for inserting the nozzle of the welding gun. The lower end of the positioning block (2) is provided with a storage groove (22). The upper end of the positioning block (2) is also provided with a positioning hole (23) for inserting the tungsten needle of the welding gun. The positioning hole (23) is located in the center of the positioning groove (21) and communicates with the storage groove (22). The positioning groove (21) is provided with a sleeve (4) coaxial with the positioning hole (23). The sleeve (4) is inserted into the nozzle. The inner wall of the sleeve (4) is provided with multiple inner scrapers evenly distributed around the center line of the positioning hole (23). The inner scrapers abut against the side wall of the tungsten needle. The base (1) is provided with a driving member (3) for driving the positioning block (2) to rotate. The sleeve (4) has a receiving groove (43) on its outer side wall. An outer scraper that slides in a direction perpendicular to the axis of the sleeve (4) is slidably connected in the receiving groove (43). The sleeve (4) is provided with a control mechanism (5) for controlling the movement of the outer scraper. The control mechanism (5) includes a return spring (51), one end of which is fixed to the side of the outer scraper near the axis of the sleeve (4), and the other end is fixed inside the sleeve (4). When the return spring (51) is in the normal state, the outer scraper is inserted into the receiving groove (43). The control mechanism (5) also includes a limiting component (52) that restricts the movement of the outer scraper. The limiting component (52) includes a rack (521) fixed on the outer scraper, a pawl (522) engaged on the rack (521), the pawl (522) being rotatably connected to the sleeve (4), and a torsion spring between the pawl (522) and the sleeve (4) driving the pawl (522) to engage with the rack (521). A control rod (523) parallel to the axis of the sleeve (4) is provided on one side of the pawl (522), the control rod (523) being slidably connected to the sleeve (4), one end of the control rod (523) extending out of the top of the sleeve (4) and being fixedly connected to a connecting ring (528), and a washer (528) being rotatably connected to the side of the connecting ring (528) away from the sleeve (4). 9) The other end of the control rod (523) is provided with a support spring (527) for connecting the sleeve (4). The control rod (523) is provided with a waist-shaped hole (524). The pawl (522) is provided with a lever (525). The end of the lever (525) away from the pawl (522) is inserted into the waist-shaped hole (524). When the connecting ring (528) abuts against the sleeve (4), the pawl (522) is engaged with the rack (521). When the connecting ring (528) is away from the sleeve (4), the control rod (523) drives the lever (525) to rotate through the hole wall of the waist-shaped hole (524), and the pawl (522) disengages from the rack (521). A baffle (53) is provided at the opening of the receiving groove (43). The baffle (53) is inserted into the sleeve (4) and is slidably connected to the sleeve (4). A moving block (54) is provided on one side of the baffle (53) inside the sleeve (4). A driving block (526) is provided on the control rod (523) to abut against the moving block (54) and to drive the baffle (53) to block the opening of the receiving groove (43). A connecting spring is provided between the baffle (53) and the sleeve (4). The positioning hole (23) is provided with a shearing assembly (6) at one end near the storage groove (22). The shearing assembly (6) includes a plurality of shearing blades (62) around the center line of the positioning hole (23). The shearing blades (62) are inclined. One end of the shearing blade (62) is inserted into the sleeve (4) and is slidably connected to the sleeve (4) along the inclined direction of the shearing blade (62). The other end of the shearing blade (62) is inclined downward. The end of the shearing blade (62) located inside the sleeve (4) is slidably connected to a pressure plate (61). The pressure plate (61) is fixed on the control rod (523).

2. The welding torch cleaning device according to claim 1, characterized in that, Each of the inner scrapers is spirally distributed on the inner wall of the sleeve (4).

3. The welding torch cleaning device according to claim 1, characterized in that, The connecting ring (528) has an oil storage cavity (5281) inside. Both the inner and outer side walls of the connecting ring (528) are provided with oil drain holes (5282) that connect the oil storage cavity (5281) and the outside. The oil drain holes (5282) are located at the upper end of the oil storage cavity (5281).

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