Electrode coating device

Abstract

The application belongs to the technical field of electric welding processing equipment, and discloses a welding rod coating device, which comprises a base, a movable assembly is hingedly connected to one end of the base, a mounting rack is fixedly installed at the middle end of the top of the base, a clamping assembly is movably connected to the inner upper end of the mounting rack, a moving assembly is movably connected to the inner lower end of the mounting rack and located below the clamping assembly, and a motor-driven lifting rod is fixedly connected to the middle of the bottom end of the moving assembly. The clamping assembly and the moving assembly are matched to greatly improve the coating effect of the welding rod coating. The driving motor is started, and the lower end of the welding core is completely inserted into the middle of the material in the material placing box. At this time, the material for making the coating will coat the surface of the welding core. The welding core is completely inserted into the coating material, and the coating effect of the welding rod coating is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric welding processing equipment, and specifically relates to a welding rod coating device. BACKGROUND

[0002] The welding rod is a metal rod that is melted and filled in the joint of a workpiece during gas welding or electric welding, and the material of the welding rod is usually the same as that of the workpiece.

[0003] The welding rod coating, also known as the coating, is prepared by mixing glass water and then pressing and coating it on the core of the welding rod, and is mainly used to meet the needs of welding to ensure that the deposited metal has certain chemical composition and performance.

[0004] During the coating process, the staff holds one end of the welding core, then mixes and stirs the raw materials required for the coating according to the specified amount, and then applies the stirred coating raw material to the surface of the welding core, and then dries it to achieve the production of the welding rod coating. However, there are still drawbacks in actual work: SUMMARY

[0005] (I) Technical problems solved

[0006] To solve the problems in the background art, the application provides a welding rod coating device, which has the advantages of improving the coating effect, by setting the cooperation of the clamping assembly and the moving assembly and other structures, thereby greatly improving the coating effect of the welding rod coating; by setting the cooperation of the moving assembly and the pushing assembly and other structures, thereby improving the coating efficiency of the welding rod coating; by setting the cooperation of the first clamping block and the second clamping block and other structures, thereby realizing the simultaneous coating of multiple welding rods, and reducing the labor cost.

[0007] (II) Technical solutions

[0008] In order to achieve the above object, the present application provides the following technical scheme: a welding rod coating device, comprising a base, one end of the base is hingedly connected with a movable assembly, the middle end of the top of the base is fixedly connected with a mounting rack, the inner part of the upper end of the mounting rack is movably connected with a clamping assembly, the inner part of the lower end of the mounting rack is movably connected with a moving assembly below the clamping assembly, the middle part of the bottom end of the moving assembly is fixedly connected with an electric lifting rod, the bottom of the electric lifting rod is fixedly connected with the base, the upper end of the movable assembly is fixedly connected with a pushing assembly, the front and back of the mounting rack are fixedly connected with a connecting assembly, and the end of the connecting assembly away from the mounting rack is fixedly connected with the movable assembly.

[0009] In the above technical scheme, preferably, the top of the base away from the moving assembly is fixedly connected with a baffle, and the width value of the baffle is the same as the width value of the base.

[0010] In the above technical scheme, preferably, the movable assembly comprises an activity plate, the inner end of the activity plate is hingedly connected with the base, the upper end of the side wall of the activity plate close to the moving assembly is fixedly connected with a rectangular plate, and the inner part of the side wall of the activity plate is hingedly connected with a limiting block at both ends.

[0011] In the above technical scheme, preferably, the pushing assembly comprises a pneumatic cylinder, the pneumatic cylinder is arranged at the upper end of the side wall of the movable assembly away from the moving assembly, one end of the pneumatic cylinder close to the moving assembly penetrates through the movable assembly and extends above the movable assembly and is fixedly connected with a pushing plate.

[0012] In the above technical scheme, preferably, the clamping assembly comprises a first clamping block, a second clamping block and a hinge element, the first clamping block and the second clamping block are movably connected in the inner part of the mounting rack respectively, the front and back of the first clamping block and the second clamping block are fixedly connected with a clamping block, the outer end of the clamping block is movably connected with the outer side of the mounting rack, the front and back of the first clamping block are hingedly connected with the second clamping block through the hinge element, the outer end of the hinge element is fixedly connected with a driving motor, the outer surface of the driving motor is fixedly connected with the mounting rack, the bottom of the side of the first clamping block away from the movable assembly is fixedly connected with six spring telescopic cylinders at equal distances, and the bottom of the spring telescopic cylinder is fixedly connected with the second clamping block.

[0013] In the above technical scheme, preferably, the moving assembly comprises a material placing box, the front and back of the material placing box are movably connected in the inner part of the mounting rack, the bottom of the material placing box is hingedly connected with a connecting block at both ends, and the bottom of the two connecting blocks is movably connected in the inner part of the top end of the base.

[0014] In the above technical solution, preferably, the connecting assembly is provided with two groups, the two groups of the connecting assembly are respectively fixedly connected with the front and rear ends of the mounting rack, the connecting assembly comprises a servo motor, one end of the servo motor close to the mounting rack is fixedly connected with the mounting rack, one end of an output shaft of the servo motor is wound with a connecting belt, one end of the connecting belt away from the servo motor is wound with a round shaft, and the round shaft is fixedly connected with the movable plate.

[0015] In the above technical solution, preferably, the front and rear sides of the rectangular plate are both fixedly installed with rectangular baffles, and the height value of the rectangular baffle is six to eight centimeters.

[0016] In the above technical solution, preferably, the outer shape of the upper end of the mounting rack is a circular ring, and the inner wall of the mounting rack is movably connected with the outer wall of the hinge element.

[0017] In the above technical solution, preferably, an arc-shaped groove is formed in the top of the rectangular plate.

[0018] (Three) beneficial effects

[0019] Compared with the prior art, the beneficial effects of the present application are as follows:

[0020] By cooperating the clamping assembly and the moving assembly, the coating effect of the welding rod coating is greatly improved, the driving motor is started, the operation of the driving motor drives the hinge element to rotate the first clamping block and the second clamping block by 90 degrees, so that the welding core is located above the material placing box, the electric lifting rod is started, the electric lifting rod moves the material placing box upward in the inside of the mounting rack, and the lower end of the welding core is completely inserted into the middle of the material in the material placing box, at this time, the material coated with the coating is used to coat the surface of the welding core, and by completely inserting the welding core into the coating material, the coating effect of the welding rod coating is improved.

[0021] By cooperating the moving assembly and the pushing assembly, the coating efficiency of the welding rod coating is improved, a certain number of welding cores are placed in the arc-shaped groove on the top of the rectangular plate, the pneumatic cylinder is started, the pushing plate pushes the welding core, with the continuous pushing of the pushing plate, the welding core will gradually contact the clamping assembly, at this time, the hinge element is pressed inward, the first clamping block and the second clamping block move in opposite directions, the welding core moves between the first clamping block and the second clamping block, and the first clamping block and the second clamping block are re-clamped together due to the cooperation of the spring telescopic cylinder, thereby realizing the clamping of the welding core between the first clamping block and the second clamping block, and the automatic design cooperation improves the overall coating efficiency of the welding rod coating.

[0022] The first clamping block and the second clamping block are matched, so that multiple welding rods can be coated at the same time, the labor cost is reduced, the arc-shaped grooves on the top of the rectangular plate are designed, and the overall shape of the first clamping block and the second clamping block is matched, so that the staff can place the number of welding rods not more than the number of arc-shaped grooves in the arc-shaped grooves on the top of the rectangular plate, the number of arc-shaped grooves can be adjusted according to actual conditions, so that multiple welding rods can be coated at the same time, and the labor cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the application;

[0024] Figure 2 It is a side structural schematic diagram of the application;

[0025] Figure 3 It is a top structural schematic diagram of the application;

[0026] Figure 4 It is a back structural schematic diagram of the application;

[0027] Figure 5 It is a side structural schematic diagram of the application;

[0028] Figure 6 It is a local structural matching relationship schematic diagram of the rectangular plate and the connecting assembly;

[0029] Figure 7 It is a internal structural matching relationship schematic diagram of the clamping assembly;

[0030] Figure 8 It is a local structural matching relationship schematic diagram of the pushing assembly and the movable assembly.

[0031] In the figure: 1, base; 2, movable assembly; 21, movable plate; 22, rectangular plate; 23, limiting block; 3, mounting frame; 4, pushing assembly; 41, air cylinder; 42, pushing plate; 5, clamping assembly; 51, first clamping block; 52, second clamping block; 53, clamping block; 54, hinged element; 55, driving motor; 56, spring telescopic cylinder; 6, moving assembly; 61, material placing box; 62, connecting block; 7, electric lifting rod; 8, connecting assembly; 81, servo motor; 82, round shaft; 83, connecting belt; 9, baffle. DETAILED DESCRIPTION

[0032] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0033] As shown in Figures 1 to 8 The present application provides a welding rod coating device, which comprises a base 1, a movable assembly 2 hinged at one end of the base 1, a mounting frame 3 fixedly installed at the middle end of the top of the base 1, a clamping assembly 5 movably connected inside the upper end of the mounting frame 3, a moving assembly 6 movably connected inside the lower end of the mounting frame 3 below the clamping assembly 5, an electric lifting rod 7 fixedly connected at the middle of the bottom end of the moving assembly 6, the bottom of the electric lifting rod 7 fixedly connected with the base 1, a pushing assembly 4 fixedly installed at the upper end of the movable assembly 2, a connecting assembly 8 fixedly installed on the front and back of the mounting frame 3, the end of the connecting assembly 8 away from the mounting frame 3 fixedly connected with the movable assembly 2. The above scheme has the following advantages: through the design of the above structure, when the pushing assembly 4 starts to run, the pushing assembly 4 will push the welding core at the top of the movable assembly 2, so that it gradually moves to the inside of the clamping assembly 5, then the clamping assembly 5 is used to clamp the welding core, and the clamping assembly 5 is rotated to turn the clamped welding core by 90 degrees, at this time the electric lifting rod 7 is started, the running of the electric lifting rod 7 will drive the moving assembly 6 to move upward, at this time the viscous raw material of the welding rod coating in the moving assembly 6 will coat the surface of the welding core, thereby greatly improving the coating effect of the welding rod coating and saving the labor intensity of the manual operation of the workers.

[0034] As shown in Figure 4 , Figure 5 , Figure 6As shown, the movable assembly 2 comprises a movable plate 21, the inner end of the movable plate 21 is hinged to the base 1, a rectangular plate 22 is fixedly installed on the movable plate 21 close to the upper end of one side wall of the moving assembly 6, both ends of the inside of one side wall of the movable plate 21 are hinged to limiting blocks 23, a baffle 9 is fixedly installed on the top of the base 1 away from the moving assembly 6, the width value of the baffle 9 is the same as the width value of the base 1, by using the above scheme: through the design of the baffle 9, when the movable assembly 2 is pulled by the connecting assembly 8 and presents a vertical state with the base 1, at this time the baffle 9 will block the movable assembly 2, ensuring the stability of the movable assembly 2 when it is fixed; through the design of the movable plate 21 to the limiting block 23, when the connecting assembly 8 pulls the movable plate 21, at this time the movable plate 21 will be turned over by ninety degrees and present a vertical state with the base 1, at this time the two limiting blocks 23 are pulled out from the inside of the movable plate 21 and located on one side of the baffle 9, at this time the baffle 9 will limit the whole movable plate 21 through the limiting block 23, and then ensure the stability of the fixed type.

[0035] As Figure 7 , Figure 8As shown, the clamping assembly 5 includes a first clamping block 51, a second clamping block 52 and a hinged element 54, the first clamping block 51 and the second clamping block 52 are movably clamped in the interior of the mounting frame 3 respectively, the front and back of the first clamping block 51 and the second clamping block 52 are fixedly installed with clamping blocks 53, the outer end of the clamping block 53 is movably clamped on the outside of the mounting frame 3, the front and back of the first clamping block 51 are hinged with the second clamping block 52 through the hinged element 54, the outer end of the hinged element 54 is fixedly connected with a driving motor 55, the outer surface of the driving motor 55 is fixedly connected with the mounting frame 3, the bottom of the side of the first clamping block 51 away from the movable assembly 2 is fixedly connected with six spring telescopic cylinders 56 at equal distances, the bottom of the spring telescopic cylinder 56 is fixedly connected with the second clamping block 52, the pushing assembly 4 includes a pneumatic cylinder 41, the pneumatic cylinder 41 is arranged at the upper end of the side wall of the movable assembly 2 away from the moving assembly 6, the end of the pneumatic cylinder 41 close to the moving assembly 6 penetrates through the movable assembly 2 and extends above the movable assembly 2 and is fixedly installed with a pushing plate 42, the above scheme is adopted: through the design of the pneumatic cylinder 41 and the pushing plate 42, when the pneumatic cylinder 41 starts to operate, at this time the pneumatic cylinder 41 will push the pushing plate 42 to move on the top of the limiting block 23, at this time the welding core located on the top of the limiting block 23 will gradually move into the interior of the clamping assembly 5 due to the pushing of the pushing plate 42, thereby facilitating the subsequent coating operation of the surface of the welding core; through the design of the first clamping block 51 to the spring telescopic cylinder 56, when the hinged element 54 is pressed inward, the hinged element 54 will make the first clamping block 51 and the second clamping block 52 move in opposite directions, at this time the welding core located on the top of the rectangular plate 22 will move to between the first clamping block 51 and the second clamping block 52 due to the pushing of the pushing plate 42, due to the cooperation of the spring telescopic cylinder 56, the first clamping block 51 and the second clamping block 52 will be clamped together again, thereby realizing the clamping of the welding core between the first clamping block 51 and the second clamping block 52, when the first clamping block 51 and the second clamping block 52 clamp the welding core, at this time the driving motor 55 will drive the first clamping block 51 and the second clamping block 52 to rotate by ninety degrees through the hinged element 54, then it is coated through the moving assembly 6, through the cooperation of the first clamping block 51 and the second clamping block 52, through the opposite movement to realize the clamping of the welding core, and through the driving motor 55 to realize the overturning of the first clamping block 51 and the second clamping block 52, which greatly improves the overall work efficiency, the hinged element 54 adopts two hinged plates, one end of the two hinged plates close to the first clamping block 51 and the second clamping block 52 is hinged with the first clamping block 51 and the second clamping block 52 respectively, the middle end of the two hinged plates is hinged with each other, the driving motor 55 is fixedly connected with the middle end of the two hinged plates through the hinged element 54, the connecting device adopted by the driving motor 55 when fixedly connected with the mounting frame 3 is a telescopic device, thereby ensuring the opposite and opposite movements of the clamping assembly 5.

[0036] As Figure 5 ,Figure 6 、 Figure 7 As shown, the moving component 6 includes a material placement box 61, and the front and rear ends of the material placement box 61 are movably connected to the inside of the mounting frame 3. Both ends of the bottom of the material placement box 61 are hinged with connecting blocks 62, and the bottoms of the two connecting blocks 62 are movably connected to the inside of the top of the base 1. There are two groups of connecting components 8, and the two groups of connecting components 8 are fixedly connected to the front and rear ends of the mounting frame 3 respectively. The connecting component 8 includes a servo motor 81, and the end of the servo motor 81 close to the mounting frame 3 is fixedly connected to the mounting frame 3. A connecting belt 83 is wound around one end of the output shaft of the servo motor 81, and the connecting belt 83 is away from the servo motor One end of 81 is wound with a circular shaft 82, and the circular shaft 82 is fixedly connected to the movable plate 21. Rectangular baffles are fixedly installed on the front and rear sides of the rectangular plate 22. The height of the rectangular baffles is six to eight centimeters. An arc-shaped groove is provided on the top of the rectangular plate 22. The upper end of the mounting frame 3 is in the shape of a circular ring. The inner wall of the mounting frame 3 is movably connected to the outer wall of the hinge element 54. The above scheme is adopted: through the design of the mounting frame 3, it will be convenient to apply pressure to the first clamping block 51 and the second clamping block 52 through the hinge element 54 in the future, thereby causing them to move their positions, thereby achieving the clamping of the welding core and the subsequent coating. The design of the arc-shaped groove on the top of the rectangular plate 22 will facilitate the placement of the subsequent welding cores. When the welding cores are placed on the top of the rectangular plate 22, they will be placed one by one into the inner part of the arc-shaped groove, ensuring the neatness of the welding cores when they are discharged. At the same time, the number of welding cores placed each time cannot exceed the number of arc-shaped grooves on the top of the rectangular plate 22, thereby ensuring the subsequent pushing operation of the welding cores. The design of the rectangular baffles on the front and rear sides of the rectangular plate 22 will have a stable shielding effect on both sides of the welding core when it moves, preventing it from accidentally falling outward during movement. The servo motor 81 is connected to the belt 83. Design, when the servo motor 81 starts to run, the servo motor 81 will wind and tighten one end of the connecting belt 83, and the end of the connecting belt 83 away from the servo motor 81 will pull the round shaft 82, and the round shaft 82 will drive the movable plate 21 to fold over as a whole, thereby facilitating the subsequent coating and use of the welding core; through the design of the material placement box 61 to the connecting block 62, when the material placement box 61 starts to move upward, the material placement box 61 will drive the connecting block 62 to move together, and the two connecting blocks 62 will provide stable support for the bottom of the material placement box 61.

[0037] The working principle and use process of the present invention:

[0038] In use, first, the staff will be a certain amount of welding core placed in the arc-shaped groove on the top of the rectangular plate 22, and then start the pneumatic cylinder 41, the operation of the pneumatic cylinder 41 will make the push plate 42 to the welding core a push effect, with the push plate 42 continues to push, the welding core will gradually with the clamping assembly 5 contact, at this time, press inwards hinged element 54, the hinged element 54 will make the first clamping block 51 and the second clamping block 52 move in opposite directions, the welding core will move to the first clamping block 51 and the second clamping block 52, due to the cooperation of the spring telescopic cylinder 56 will make the first clamping block 51 and the second clamping block 52 re-clamping together, thereby realizing the clamping of the welding core between the first clamping block 51 and the second clamping block 52;

[0039] After that, start the servo motor 81, the operation of the servo motor 81 will make the connection belt 83 winding in the servo motor 81 one end to present loose, at this time, the activity plate 21 due to its top weight and the connection belt 83 to remove the tension will make the activity plate 21 drive the limiting block 23, the push assembly 4 overturn, and present relative horizontal state with the base 1, conversely, when you need to clamp the electrode, at this time, start the servo motor 81, make it through the connection belt 83 to the circular shaft 82 exert tension, so that the circular shaft 82 pull the activity plate 21 and the base 1 present vertical, and the limiting block 23 against the baffle 9 to enhance the stability of the activity plate 21;

[0040] Then, start the drive motor 55, the operation of the drive motor 55 will make the hinged element 54 drive the first clamping block 51 and the second clamping block 52 ninety degrees rotation, so that the welding core is located above the material placing box 61, it should be noted that, at this time, the material placing box 61 inside placed with the stirring material made into coating, then start the electric lifting rod 7, the electric lifting rod 7 will make the material placing box 61 in the installation frame 3 inside up, and make the welding core moves to the material in the material placing box 61, at this time, the material will be coated on the surface of the welding core;

[0041] In summary, thus greatly improving the effect of coating the electrode coating, improving the coating efficiency of the electrode coating, realizing the coating of multiple electrodes at the same time, reducing the labor cost.

[0042] It should be noted that the coating of the electrode coating in the process of making raw materials, will be added to a kind of called "binder" raw material ingredients, the main binder has sodium water glass, potassium water glass and potassium sodium water glass three kinds, the purpose of using binder is to enable the coating firmly adhere to the core, when rotating clamping assembly 5 makes it drive the welding core to move to the inside of clamping assembly 6, at this time through the cooperation of electric lifting rod 7 will drive the material placing box 61 up and down, with the up and down activity of material placing box 61, will be on the surface of the welding core inside it repeatedly adhere to the coating material (can be repeated), after repeated adhesion, the welding core is placed in the material placing box 61 for five to ten minutes, so as to increase the coating effect of the coating on the surface of the welding core, in the operation process can guarantee the coating material adheres to the surface of the welding core.

[0043] It should be noted that in this document, relationship terms such as first and second are used only to distinguish one entity or action from another, and do not necessarily require or imply these entities or actions are in any actual relationship or order. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0044] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A welding rod coating device comprising a base (1), characterized in that: One end of the base (1) is hinged with a movable assembly (2), the middle end of the top of the base (1) is fixedly installed with a mounting rack (3), the inner end of the upper end of the mounting rack (3) is movably connected with a clamping assembly (5), the clamping assembly (5) comprises a first clamping block (51), a second clamping block (52) and a hinge element (54), the first clamping block (51) and the second clamping block (52) are movably clamped in the inner part of the mounting rack (3) respectively, the front and back surfaces of the first clamping block (51) and the second clamping block (52) are fixedly installed with clamping blocks (53), the outer end of the clamping block (53) is movably clamped on the outer side of the mounting rack (3), the front and back sides of the first clamping block (51) are hinged with the second clamping block (52) through the hinge element (54), the outer end of the hinge element (54) is fixedly connected with a driving motor (55), the outer surface of the driving motor (55) is fixedly connected with the mounting rack (3), the bottom of the side of the first clamping block (51) away from the movable assembly (2) is fixedly connected with six spring telescopic cylinders (56) at equal distances, the bottom of the spring telescopic cylinder (56) is fixedly connected with the second clamping block (52); The inner part of the lower end of the mounting rack (3) is movably connected with a moving assembly (6) below the clamping assembly (5), the middle part of the bottom end of the moving assembly (6) is fixedly connected with an electric lifting rod (7), the bottom of the electric lifting rod (7) is fixedly connected with the base (1), the upper end of the movable assembly (2) is fixedly installed with a pushing assembly (4), the front and back surfaces of the mounting rack (3) are fixedly installed with a connecting assembly (8), one end of the connecting assembly (8) away from the mounting rack (3) is fixedly connected with the movable assembly (2); The movable assembly (2) comprises an activity plate (21), the inner end of the activity plate (21) is hinged with the base (1), the upper end of the side wall of the activity plate (21) close to the moving assembly (6) is fixedly installed with a rectangular plate (22), the inner ends of the two ends of the side wall of the activity plate (21) are hingedly connected with limit blocks (23); The moving assembly (6) comprises a material placing box (61), the front and back ends of the material placing box (61) are movably clamped in the inner part of the mounting rack (3), the two ends of the bottom of the material placing box (61) are hingedly connected with connecting blocks (62), the bottoms of the two connecting blocks (62) are movably clamped in the inner part of the top end of the base (1); The front and back sides of the rectangular plate (22) are fixedly installed with rectangular baffles, the height value of the rectangular baffle is six to eight centimeters; The top of the rectangular plate (22) is provided with an arc-shaped groove.

2. A device for coating an electrode as claimed in claim 1, characterized in that: The top of the base (1) away from the moving assembly (6) is fixedly installed with a baffle (9), the width value of the baffle (9) is the same as the width value of the base (1).

3. A device for coating an electrode as claimed in claim 1, characterized in that: The pushing assembly (4) comprises an air cylinder (41), which is arranged at the upper end of the movable assembly (2) away from the side wall of the moving assembly (6), and the end of the air cylinder (41) close to the moving assembly (6) penetrates through the movable assembly (2) and extends above the movable assembly (2) and is fixedly installed with a pushing plate (42).

4. The device of claim 1, wherein: The connecting assembly (8) is provided with two groups, and the two groups of connecting assemblies (8) are fixedly connected with the front and rear ends of the mounting rack (3) respectively. The connecting assembly (8) comprises a servo motor (81), one end of the servo motor (81) close to the mounting rack (3) is fixedly connected with the mounting rack (3), one end of the output shaft of the servo motor (81) is wound with a connecting belt (83), one end of the connecting belt (83) away from the servo motor (81) is wound with a round shaft (82), and the round shaft (82) is fixedly connected with the movable plate (21).

5. A device for covering an electrode with a coating according to claim 1, characterized in that: The outer shape of the upper end of the mounting rack (3) is circular, and the inner wall of the mounting rack (3) is movably connected with the outer wall of the hinge element (54).

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