Explosion-proof safe permanent magnet coupler

Abstract

The utility model discloses an explosion-proof safety permanent magnet coupler which comprises a permanent magnet coupler body, the permanent magnet coupler body comprises an input shaft body and an explosion-proof shell, one side of the input shaft body is in bolted connection with two sets of semi-ring fixing blocks, one sides of the two sets of semi-ring fixing blocks are fixedly connected with a fixing shell, and the other sides of the two sets of semi-ring fixing blocks are fixedly connected with the explosion-proof shell. The device comprises a fixing shell, a containing cavity is formed in the fixing shell, a receding groove is formed in the fixing shell, one end of the receding groove penetrates through the fixing shell, extension plates are slidably inserted into the receding groove, and the two extension plates are semicircular. According to the permanent magnet coupler, the extension plate can slide in the receding groove, flexible adjustment can be conducted according to the distance between the driving shaft and the driven shaft, through modular design, the permanent magnet coupler body and the driving shaft can be conveniently installed and fixed, and the coupler body has better use flexibility and convenience.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical drive technical field, concretely is a kind of explosion-proof safety permanent magnet coupling. BACKGROUND

[0002] In modern industrial production, as an important component in mechanical transmission system, coupling undertakes the task of transmitting power from prime mover to working machine. Especially in the environment of chemical industry, petroleum, coal mine and other explosive hazards, the application of explosion-proof safety coupling is crucial. As a new type of non-contact transmission device, permanent magnet coupling has been widely used in these fields due to its advantages of no leakage, high efficiency, simple structure and so on. Explosion-proof safety permanent magnet coupling, as a special type of permanent magnet coupling, not only inherits all the advantages of permanent magnet coupling, but also pays special attention to the design of explosion-proof safety performance. It utilizes the magnetic force between rare earth permanent magnets to realize the non-contact coupling between driving shaft and driven shaft, thereby effectively avoiding the safety hazards caused by mechanical wear, sealing leakage and other problems of traditional coupling.

[0003] However, in the prior art, there are still some limitations in the connection mode of coupling with driving shaft and driven shaft. Specifically, when the distance between driving shaft and driven shaft is fixed, the existing coupling is often not convenient for flexible adjustment according to this distance, so we need to propose an explosion-proof safety permanent magnet coupling. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing an explosion-proof safety permanent magnet coupling to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] An explosion-proof safety permanent magnet coupling comprises a permanent magnet coupling body, the permanent magnet coupling body includes an input shaft body and an explosion-proof shell, one side of the input shaft body is bolted with two groups of half-ring fixed blocks, one side of the two groups of half-ring fixed blocks is fixedly connected with a fixed shell, a clearance slot is formed in the inside of the fixed shell, one end of the clearance slot penetrates the fixed shell, and an extension plate is slidably inserted into the inside of the clearance slot, the two groups of extension plates are arranged in a semicircular shape, and a containing cavity is reserved between the two groups of extension plates, a driving shaft is arranged in the containing cavity, and the driving shaft is fixedly connected with the extension plate.

[0007] Preferably, a plurality of groups of springs are fixedly connected to the inner wall of one side of the clearance slot, and one end of each group of the plurality of groups of springs is fixedly connected with one end of the extension plate.

[0008] Preferably, two groups of fixed plates are fixedly connected to the outer wall of the extension plate, and a through slot adapted to the fixed plate is formed in the outer wall of the fixed shell.

[0009] Preferably, the through slot is in communication with the inside of the accommodation slot, and the fixing plate is slidingly connected to the inside of the through slot.

[0010] Preferably, a plurality of groups of through holes are formed in the fixing plate, first screws are inserted into the inside of the through holes, and a plurality of groups of first nuts are threadedly connected to the bottom end of the first screws.

[0011] Preferably, a plurality of groups of first threaded blind holes are formed in the outer wall of the driving shaft, a plurality of groups of first threaded through holes are formed in the extension plate and are matched with the first threaded blind holes, and first fixing screws are threadedly connected to the inside of the first threaded blind holes and the first threaded through holes.

[0012] Preferably, a plurality of groups of second threaded blind holes are formed in the side wall of the input shaft body, a plurality of groups of second threaded through holes are formed in the half-ring fixing block and are matched with the second threaded blind holes, and second fixing screws are threadedly connected to the inside of the second threaded through holes and the second threaded blind holes.

[0013] Preferably, the input shaft body is rotationally connected to the explosion-proof shell, and a permanent magnet disc is fixedly connected to the end of the input shaft body away from the half-ring fixing block.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The half-ring fixing block, the fixing shell, the accommodation slot, the extension plate and the accommodating cavity are cooperatively used, the extension plate is slid in the accommodation slot, the distance between the driving shaft and the driven shaft can be flexibly adjusted, the modular design is adopted, the permanent magnet coupling body is conveniently installed and fixed with the driving shaft, and the coupling body has better use flexibility and convenience. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a structural schematic view of the shaft side of the utility model;

[0018] Figure 3 It is a structural schematic view of the input shaft body, the fixing shell and the extension plate of the utility model;

[0019] Figure 4 It is a structural schematic view of the fixing shell, the accommodation slot and the extension plate of the utility model.

[0020] In the figure: 101, input shaft body; 102, explosion-proof shell; 2, half ring fixed block; 3, fixed shell; 4, let go of the slot; 5, extension plate; 6, containing cavity; 7, driving shaft; 8, spring; 9, fixed plate; 10, through slot; 11, through hole; 12, first screw; 13, first nut; 14, first threaded blind hole; 15, first threaded through hole; 16, first fixed screw; 17, second threaded blind hole; 18, second threaded through hole; 19, second fixed screw. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0022] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0023] The explosion-proof safety permanent magnet coupling comprises a permanent magnet coupling body, the permanent magnet coupling body comprises an input shaft body 101 and an explosion-proof shell 102, the input shaft body 101 is used as the core transmission component of the coupling, the design ensures efficient transmission of torque, the use of the explosion-proof shell 102 enhances the safety performance of the coupling in a potential explosion environment, effectively isolates the influence of external fire sources or explosive gases on the inside of the coupling, and guarantees stable operation of equipment, a closed magnetic transmission cavity is formed by the input shaft body 101 and the explosion-proof shell 102, the explosion-proof shell 102 adopts a double-layer 304 stainless steel welded structure, the inner layer surface is treated with an antistatic coating, one side of the input shaft body 101 is bolted with two groups of half ring fixed blocks 2, one side of the two groups of half ring fixed blocks 2 is fixedly connected with a fixed shell 3, the fixed shell 3 is provided with a let go slot 4 in the inside, one end of the let go slot 4 penetrates through the fixed shell 3, and the inside of the let go slot 4 is slidably connected with extension plates 5, the two groups of extension plates 5 are arranged in a semicircular shape, and a containing cavity 6 is reserved between the two groups of extension plates 5, a driving shaft 7 is arranged in the inside of the containing cavity 6, and the driving shaft 7 is fixedly connected with the extension plates 5, through the cooperation of the half ring fixed blocks 2, the fixed shell 3, the let go slot 4, the extension plates 5 and the containing cavity 6, the extension plates 5 can slide in the inside of the let go slot 4, so that the distance between the driving shaft 7 and a driven shaft can be flexibly adjusted, through modular design, the permanent magnet coupling body is convenient to install and fix with the driving shaft 7, and the coupling body has better use flexibility and convenience.

[0024] A plurality of groups of springs 8 are fixedly connected to the inner wall of one side of the give-way groove 4, one end of each of the plurality of groups of springs 8 is fixedly connected to one end of the extension plate 5, the plurality of groups of springs 8 are stainless steel helical compression springs (wire diameter Φ3mm, free length 50mm, stiffness coefficient 20N / mm), and are evenly distributed (interval angle 30°) along the circumference of the give-way groove 4. When the driving shaft 7 is subjected to an axial impact load, the spring 8 can absorb a displacement of 5-8mm, reduce the instantaneous impact force by 40%-50%, and automatically restore the original transmission position through the elastic reset function. The spring pre-tightening force is set to 50N to ensure the position stability of the transmission system under normal working conditions;

[0025] Two groups of fixed plates 9 are fixedly connected to the outer wall of the extension plate 5, and a through groove 10 adapted to the fixed plate 9 is formed in the outer wall of the fixed shell 3. The fixed plate 9 is an L-shaped reinforcing rib structure (thickness 8mm) and is fixedly welded to the outer wall of the extension plate 5 by argon arc welding. A polytetrafluoroethylene wear-resistant bushing (thickness 2mm) is arranged on the inner surface of the through groove 10, so that the sliding friction coefficient of the fixed plate 9 is reduced to below 0.1. This structure can withstand a radial load of 2000N without plastic deformation, ensuring that the extension plate 5 does not jam during sliding;

[0026] The through groove 10 is in communication with the inside of the give-way groove 4, and the fixed plate 9 is slidingly connected to the inside of the through groove 10. The communication passage between the through groove 10 and the give-way groove 4 is chamfered (R angle 3mm) to avoid stress concentration. A limiting boss (height 2mm) is arranged at the end of the fixed plate 9 to cooperate with the rubber buffer pad at the end of the through groove 10 to limit the sliding stroke from exceeding the designed range. This design enables the coupling to maintain stable transmission under vibration working conditions (frequency ≤50Hz);

[0027] A plurality of groups of through holes 11 are formed in the fixed plate 9, and a first screw rod 12 is inserted into the inside of each through hole 11. A plurality of groups of first nuts 13 are threadedly connected to the bottom end of the first screw rod 12. The first screw rod 12 is an M8 fine-thread stainless steel screw rod (pitch 1mm), and the diameter of the through hole 11 is designed to be Φ8.5mm to compensate for the assembly tolerance. The first nut 13 adopts a locknut structure (interval 2mm) and is coated with a threaded fastening glue (strength grade ≥8.8 grade). After the position adjustment of the extension plate 5 is completed, a tightening torque of 25N·m is applied by a torque wrench to achieve an axial positioning accuracy of ±0.05mm;

[0028] A plurality of groups of first threaded blind holes 14 are formed on the outer wall of the driving shaft 7, a plurality of groups of first threaded through holes 15 are formed on the extension plate 5 and are matched with the first threaded blind holes 14, the first threaded blind holes 14 and the first threaded through holes 15 are internally screwed with first fixing screws 16, the first threaded blind holes 14 are M6 deep holes (depth 12mm, hole bottom taper angle 118°), and the first threaded through holes 15 are designed as stepped holes (upper Φ7mm hole expanding section depth 3mm). The head of the first fixing screw 16 is sunk below the surface of the extension plate 5 by 1mm to avoid interference with the inner wall of the explosion-proof shell 102. The connection mode enables the driving shaft 7 to withstand 500N·m torque without relative slip;

[0029] A plurality of groups of second threaded blind holes 17 are formed on the side wall of the input shaft body 101, a plurality of groups of second threaded through holes 18 are formed on the half-ring fixed block 2 and are matched with the second threaded blind holes 17, and the second threaded through holes 18 are internally screwed with second fixing screws 19 with the second threaded blind holes 17, the second threaded blind holes 17 are M10×1.5 threaded holes (depth 15mm) and are uniformly distributed along the end surface of the input shaft body 101 in 8 groups (distribution circle diameter Φ120mm). The second fixing screw 19 is a 12.9 grade high-strength internal hexagonal screw, and the permanent anti-loosening is realized by cooperating with anaerobic glue;

[0030] The input shaft body 101 is rotationally connected with the explosion-proof shell 102, the input shaft body 101 is fixedly connected with a permanent magnet disc at the end away from the half-ring fixed block 2, the input shaft body 101 is connected with the explosion-proof shell 102 through a double-row angular contact ball bearing (model 7208AC), and the bearing chamber is filled with lithium-based lubricating grease (drop point ≥180℃). The permanent magnet disc adopts a neodymium iron boron N52 magnetic steel (remanence 1.45T) and is arranged according to a Halbach array (polar arc coefficient 0.82), 12 pairs of pole magnetic circuits are formed between the permanent magnet disc and a driven disc, and a torque transmission efficiency of more than 96% is realized. The joint surface of the explosion-proof shell 102 adopts an O-shaped fluorine rubber sealing ring (compression amount 25%), and is subjected to Ex d IIB T4 Gb explosion-proof certification.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof safety permanent magnet coupling, characterized by, Include: Permanent magnet coupling body, the permanent magnet coupling body includes input shaft body (101) and explosion-proof shell (102), one side of the input shaft body (101) is bolted with two groups of half ring fixed blocks (2), one side of two groups of the half ring fixed blocks (2) is fixedly connected with the fixed shell (3), the inside of the fixed shell (3) is provided with a let slot (4), one end of the let slot (4) penetrates the fixed shell (3), and the inside of the let slot (4) is slidably connected with the extension plate (5), two groups of the extension plate (5) are arranged in a semicircle, and an accommodating cavity (6) is reserved between two groups of the extension plate (5), the inside of the accommodating cavity (6) is provided with a driving shaft (7), and the driving shaft (7) is fixedly connected with the extension plate (5).

2. The explosion-proof safety permanent magnet coupling according to claim 1, characterized in that: The inside wall of the let slot (4) is fixedly connected with a plurality of groups of springs (8), and one end of each of the plurality of groups of springs (8) is fixedly connected with one end of the extension plate (5).

3. The explosion-proof safety permanent magnet coupling according to claim 1, characterized in that: The outer wall of the extension plate (5) is fixedly connected with two groups of fixed plates (9), and the outer wall of the fixed shell (3) is provided with a through groove (10) matched with the fixed plate (9).

4. The explosion-proof safety permanent magnet coupling according to claim 3, characterized in that: The through groove (10) is in communication with the inside of the let slot (4), and the fixed plate (9) is slidably connected in the inside of the through groove (10).

5. The explosion-proof safety permanent magnet coupling according to claim 4, characterized in that: A plurality of groups of through holes (11) are formed in the fixed plate (9), a first screw rod (12) is inserted into the inside of the through hole (11), and the bottom end of the first screw rod (12) is threadedly connected with a plurality of groups of first nuts (13).

6. The explosion-proof safety permanent magnet coupling of claim 1, wherein: A plurality of groups of first threaded blind holes (14) are formed in the outer wall of the driving shaft (7), a first threaded through hole (15) matched with the plurality of groups of first threaded blind holes (14) is formed in the extension plate (5), and the first threaded blind hole (14) and the first threaded through hole (15) are threadedly connected with a first fixed screw (16).

7. The explosion-proof safety permanent magnetic coupling according to claim 1, characterized in that: A plurality of groups of second threaded blind holes (17) are formed in the side wall of one side of the input shaft body (101), a second threaded through hole (18) matched with the second threaded blind hole (17) is formed in the half ring fixed block (2), and the second threaded through hole (18) and the second threaded blind hole (17) are threadedly connected with a second fixed screw (19).

8. The explosion-proof safety permanent magnetic coupling according to claim 1, characterized in that: The input shaft body (101) is rotatably connected with the explosion-proof shell (102), and the end of the input shaft body (101) away from the half ring fixed block (2) is fixedly connected with a permanent magnet disc.

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