A stretching device for a coupling

Abstract

The present application relates to the technical field of stretching equipment, provide a kind of stretching device for coupling, comprising: base, detachable fixed on the cover of the base, first double-end screw, second double-end screw, first nut, second nut, third nut and fourth nut;First U-shaped groove is opened on the top of the base, the bottom of the cover is equipped with second U-shaped groove;The first U-shaped groove and the second U-shaped groove are enclosed to form the hole for the coupling to pass;The inner wall of the first U-shaped groove has first clamping groove, the inner wall of the second U-shaped groove has second clamping groove, the first clamping groove and the second clamping groove are communicated to form annular groove for flange on the outer surface of coupling to be inserted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of stretching equipment, and more particularly relates to a stretching device for a coupling. BACKGROUND

[0002] Couplings are very commonly used in mechanical transmission, and toothed couplings are particularly widely used. A toothed coupling generally comprises a sleeve with an internal toothed portion, a flange arranged on the outer surface of the sleeve, and a shaft body extending into the sleeve, the shaft body being provided with an external toothed portion that meshes with the internal toothed portion (of the sleeve). Sometimes, users need to adjust the relative position between the shaft body and the sleeve in the extension direction of the shaft body, which is very laborious and inaccurate in terms of the distance moved if the user adjusts it by hand.

[0003] Please refer to the Chinese invention patent CN105422659A, which discloses a toothed coupling. The toothed coupling can be referred to the toothed coupling in CN105422659A, and the flange can be referred to the flange in CN105422659A.

[0004] Please refer to the Chinese invention patent CN216199944U, which discloses a drum-shaped toothed coupling. The toothed coupling can be referred to the toothed coupling in CN216199944U, the flange can be referred to the flange in CN216199944U, the sleeve can be referred to the inner toothed ring in CN216199944U, and the shaft body can be referred to the outer toothed shaft sleeve in CN216199944U. SUMMARY

[0005] The present application aims to provide a stretching device for a coupling to solve the technical problem of inaccurate manual adjustment of the relative displacement between the sleeve and the shaft body of the coupling in the prior art.

[0006] To achieve the above object, the technical scheme adopted by the present application is: provide a kind of for the stretching device of coupling, it includes: base, detachable fixed on the cover of the base, first double-end screw, second double-end screw, first nut, second nut, third nut and fourth nut;First U-shaped groove is opened on the top of the base, the bottom of the cover is equipped with second U-shaped groove;The first U-shaped groove and the second U-shaped groove are enclosed to form the hole for coupling to pass;The inner wall of the first U-shaped groove has first clamping groove, the inner wall of the second U-shaped groove has second clamping groove, and the first clamping groove and the second clamping groove are communicated to form annular groove for flange on the outer surface of coupling to be inserted;First mounting hole is opened on the base, the first double-end screw is arranged in the first mounting hole, the first nut is arranged at one end of the first double-end screw, and the second nut is arranged at the other end of the first double-end screw;Second mounting hole is opened on the cover, the second double-end screw is arranged in the second mounting hole, the third nut is arranged at one end of the second double-end screw, and the fourth nut is arranged at the other end of the second double-end screw.

[0007] Further, it also includes: first ear plate arranged at one end of the base, second ear plate arranged at the other end of the base, third ear plate arranged at one end of the cover, fourth ear plate arranged at the other end of the cover, first fastening assembly and second fastening assembly;The first ear plate is detachably fixedly connected with the third ear plate by the first fastening assembly, and the second ear plate is detachably fixedly connected with the fourth ear plate by the second fastening assembly.

[0008] Further, the first fastening assembly includes: first assembly hole opened on the first ear plate, third assembly hole opened on the third ear plate, first screw passing through the third assembly hole and being threadedly connected with the first assembly hole;

[0009] The second fastening assembly includes: second assembly hole opened on the second ear plate, fourth assembly hole opened on the fourth ear plate, second screw passing through the fourth assembly hole and being threadedly connected with the second assembly hole.

[0010] Further, the first ear plate, the second ear plate, the third ear plate and the fourth ear plate are respectively flat plates, and the first ear plate, the second ear plate, the third ear plate and the fourth ear plate are respectively arranged in parallel with each other.

[0011] Further, the annular groove is circular.

[0012] Further, the surface of the first ear plate is smoothly connected with the surface of the base, the surface of the second ear plate is smoothly connected with the surface of the base, the surface of the third ear plate is smoothly connected with the surface of the cover, and the surface of the fourth ear plate is smoothly connected with the surface of the cover.

[0013] Further, the number of the first mounting holes and the first stud bolts is two respectively; two first mounting holes and two first stud bolts are one-to-one corresponding.

[0014] The number of the second mounting holes and the second stud bolts is two respectively; two second mounting holes and two second stud bolts are one-to-one corresponding.

[0015] Further, the hole diameter of the first mounting hole is the same as the outer diameter of the first stud bolt, and the hole diameter of the second mounting hole is the same as the outer diameter of the second stud bolt.

[0016] Further, the first stud bolt and the second stud bolt are arranged in parallel.

[0017] Further, the base can move 3mm-4mm relative to the first stud bolt, and the cover can move 3mm-4mm relative to the second stud bolt.

[0018] The stretch device for the shaft coupling has the advantages that, compared with the prior art, the stretch device for the shaft coupling is characterized in that a first mounting hole is formed in the base, a first double-end screw rod is arranged in the first mounting hole, the two ends of the first double-end screw rod are located outside the first mounting hole, a first nut is threadedly connected with one end of the first double-end screw rod, a second nut is threadedly connected with the other end of the first double-end screw rod, the first nut and the second nut are located on the two sides of the base, a second mounting hole is formed in the cover, a second double-end screw rod is arranged in the second mounting hole, the two ends of the second double-end screw rod are located outside the second mounting hole, a third nut is threadedly connected with one end of the second double-end screw rod, a fourth nut is threadedly connected with the other end of the second double-end screw rod, the third nut and the fourth nut are located on the two sides of the cover, the top of the base is provided with a first U-shaped groove, the bottom of the cover is provided with a second U-shaped groove, and the base and the cover are detachably fixedly connected, the base and the cover are folded to form a hole channel by the first U-shaped groove and the second U-shaped groove, the shaft coupling can pass through the hole channel, the inner wall of the first U-shaped groove is provided with a first clamping groove, the inner wall of the second U-shaped groove is provided with a second clamping groove, the first clamping groove and the second clamping groove are sequentially and continuously connected to form an annular groove, and the flange on the outer surface of the shaft coupling can be clamped in the annular groove, after the base is fixed to an external device through the first double-end screw rod, the base can slide along the first double-end screw rod when the first nut or the second nut is adjusted, after the cover is fixed to the external device through the second double-end screw rod, the cover can slide along the second double-end screw rod when the third nut and the fourth nut are adjusted, the position of the base along the first double-end screw rod can be adjusted by adjusting the position of the first nut or the second nut on the first double-end screw rod, the moving position of the base is very convenient and more accurate (compared with manually adjusting the position of the base), the position of the cover along the second double-end screw rod can be adjusted by adjusting the position of the third nut and the fourth nut on the second double-end screw rod, the moving position of the cover is very convenient and more accurate (compared with manually adjusting the position of the cover), and the sleeve with the flange on the shaft coupling can be moved by the movement of the base and the cover. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0020] Figure 1 The front view schematic diagram of the stretch device for the shaft coupling provided by the embodiments of the present application (the first double-end screw rod, the second double-end screw rod, the first nut, the third nut, the third nut, and the fourth nut are hidden);

[0021] Figure 2The top view schematic view of the stretching device for the shaft coupling (the first double-end screw rod, the second double-end screw rod, the first nut, the third nut, the third nut, the fourth nut are hidden) provided by the embodiment of the present application is shown in the figure;

[0022] Figure 3 The Figure 2 The middle A-A sectional view is shown in the figure;

[0023] Figure 4 The front view schematic view of the first screw provided by the embodiment of the present application is shown in the figure;

[0024] Figure 5 The front view schematic view of the first double-end screw rod provided by the embodiment of the present application is shown in the figure;

[0025] Figure 6 The right side schematic view of the stretching device for the shaft coupling (the second ear plate and the fourth ear plate are hidden) provided by the embodiment of the present application is shown in the figure.

[0026] In the figure, the various reference signs are:

[0027] 1-base; 11-first U-shaped groove; 12-first mounting hole; 13-first ear plate; 14-second ear plate; 2-cover; 21-second U-shaped groove; 22-second mounting hole; 23-third ear plate; 24-fourth ear plate; 3-annular groove; 31-first clamping groove; 32-second clamping groove; 41-first double-end screw rod; 42-first nut; 43-second nut; 44-second double-end screw rod; 45-third nut; 46-fourth nut; 47-first screw. DETAILED DESCRIPTION

[0028] It should be noted that the specific embodiments are only used to explain the present application, and are not used to limit the present application.

[0029] It should be noted that, in the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; "and / or" in the present text is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. Wherein, A, B can be singular or plural.

[0030] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to another element or indirectly connected to another element. When an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or indirectly on the other element.

[0031] It should be noted that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate directions or positions based on the directions or positions shown in the drawings, and are merely used for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] It should be noted that the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0033] It should be noted that the term "a plurality of" means two or more, unless otherwise explicitly and specifically limited.

[0034] Please refer to Figures 1 to 6 , the present application will be described for the stretching device for coupling. The stretching device for coupling includes: base 1, detachable fixed on the base 1 cover 2, the first double head screw rod 41, the second double head screw rod 44, the first nut 42, the second nut 43, the third nut 45, and the fourth nut 46; The top of the base 1 is provided with a first U-shaped groove 11, and the bottom of the cover 2 is provided with a second U-shaped groove 21; The first U-shaped groove 11 and the second U-shaped groove 21 are enclosed to form a hole for the coupling (in an embodiment, the coupling is: tooth coupling.) Passing through; The inner wall of the first U-shaped groove 11 has a first clamping groove 31, and the inner wall of the second U-shaped groove 21 has a second clamping groove 32, and the first clamping groove 31 and the second clamping groove 32 are connected in series to form an annular groove 3 for the flange of the coupling (in an embodiment, the coupling is: tooth coupling.) The outer surface of the ring is clamped; The base 1 is provided with a first mounting hole 12, the first double head screw rod 41 is arranged in the first mounting hole 12, the first nut 42 is arranged at one end of the first double head screw rod 41, and the second nut 43 is arranged at the other end of the first double head screw rod 41; The cover 2 is provided with a second mounting hole 22, the second double head screw rod 44 is arranged in the second mounting hole 22, the third nut 45 is arranged at one end of the second double head screw rod 44, and the fourth nut 46 is arranged at the other end of the second double head screw rod 44.

[0035] Thus, the base 1 is provided with a first mounting hole 12, a first double-headed screw 41 is arranged in the first mounting hole 12, both ends of the first double-headed screw 41 are located outside the first mounting hole 12, a first nut 42 is threadedly connected with one end of the first double-headed screw 41, a second nut 43 is threadedly connected with the other end of the first double-headed screw 41, and the first nut 42 and the second nut 43 are located on both sides of the base 1; the cover 2 is provided with a second mounting hole 22, a second double-headed screw 44 is arranged in the second mounting hole 22, both ends of the second double-headed screw 44 are located outside the second mounting hole 22, a third nut 45 is threadedly connected with one end of the second double-headed screw 44, a fourth nut 46 is threadedly connected with the other end of the second double-headed screw 44, and the third nut 45 and the fourth nut 46 are located on both sides of the cover 2; the top of the base 1 is provided with a first U-shaped groove 11, the bottom of the cover 2 is provided with a second U-shaped groove 21, and the base 1 and the cover 2 are detachably fixedly connected; the base 1 and the cover 2 are folded to make the first U-shaped groove 11 and the second U-shaped groove 21 form a channel, and a shaft coupling (in an embodiment, the shaft coupling is a toothed coupling) can pass through the channel (in an embodiment, the shaft coupling passes through the channel before the base 1 and the cover 2 are folded); the inner wall of the first U-shaped groove 11 is provided with a first clamping groove 31, the inner wall of the second U-shaped groove 21 is provided with a second clamping groove 32, the first clamping groove 31 and the second clamping groove 32 are sequentially and continuously connected to form an annular groove 3, and a flange on the outer surface of the shaft coupling can be clamped in the annular groove 3; after the base 1 is fixed to an external device by the first double-headed screw 41 (for example, the end face of one end of the first double-headed screw 41 is fixed to the external device), the base 1 can slide along the first double-headed screw 41 by adjusting the first nut 42 or the second nut 43; after the cover 2 is fixed to the external device by the second double-headed screw 44 (for example, the end face of one end of the second double-headed screw 44 is fixed to the external device), the cover 2 can slide along the second double-headed screw 44 by adjusting the third nut 45 and the fourth nut 46; that is, the position of the base 1 along the first double-headed screw 41 can be adjusted by adjusting the position of the first nut 42 or the second nut 42 on the first double-headed screw 41, and the moving position of the base 1 is very convenient and more accurate (compared with adjusting the position of the base 1 by hand); that is, the position of the cover 2 along the second double-headed screw 44 can be adjusted by adjusting the position of the third nut 45 and the fourth nut 46 on the second double-headed screw 44, and the moving position of the cover 2 is very convenient and more accurate (compared with adjusting the position of the cover 2 by hand). The movement of the base 1 and the cover 2 can drive the sleeve with the flange on the shaft coupling to move.

[0036] In an embodiment, after the base 1 and the cover 2 drive the flange on the shaft coupling to move, the relative distance between the sleeve and the shaft body can be measured by a depth gauge.

[0037] In one embodiment, the shaft bodies of the coupling are arranged in parallel with the first double-end screw 41 and the second double-end screw 44, respectively.

[0038] In one embodiment, regarding the "first clamping groove 31 and the second clamping groove 32 are sequentially connected end to end", one end of the first clamping groove 31 is connected with one end of the second clamping groove 32, and the other end of the first clamping groove 31 is connected with the other end of the second clamping groove 32.

[0039] In one embodiment, the surface of the first U-shaped groove 11 is located on a predetermined cylindrical surface, and the axis of the predetermined cylindrical surface is the predetermined axis.

[0040] In one embodiment, the surface of the second U-shaped groove 21 is located on a predetermined cylindrical surface, and the axis of the predetermined cylindrical surface is the predetermined axis.

[0041] In one embodiment, the inner wall of the hole is located on a predetermined cylindrical surface.

[0042] In one embodiment, the first clamping groove 31 extends along the circumferential direction of the predetermined axis.

[0043] In one embodiment, the second clamping groove 32 extends along the circumferential direction of the predetermined axis.

[0044] In one embodiment, the annular groove 3 is axisymmetric with respect to the predetermined axis.

[0045] In one embodiment, the extension direction of the first mounting hole 12 and the extension direction of the second mounting hole 22 are arranged in parallel with each other. In one embodiment, the first mounting hole 12 and the second mounting hole 22 respectively extend along the extension direction of the predetermined axis.

[0046] In one embodiment, the base 1 is located between the first nut 42 and the second nut 43.

[0047] In one embodiment, the cover 2 is located between the third nut 45 and the fourth nut 46.

[0048] In one embodiment, the first double-end screw 41 is a cylindrical body with external threads on the surface.

[0049] In one embodiment, the second double-end screw 44 is a cylindrical body with external threads on the surface.

[0050] In one embodiment, the inner wall of the annular groove 3 is provided with anti-skid lines. In this way, the slipping of the flange when arranged in the annular groove 3 is reduced.

[0051] In one embodiment, the anti-skid lines are spiral-shaped. In one embodiment, the cross section of the anti-skid lines is a regular triangle.

[0052] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0053] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0054] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0055] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0056] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0057] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0058] In one embodiment, the adhesive layer is provided on the surface of the convex part. In one embodiment, the adhesive layer is an elastic layer.

[0059] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, further comprising: a first ear plate 13 provided at one end of the base 1, a second ear plate 14 provided at the other end of the base 1, a third ear plate 23 provided at one end of the cover 2, a fourth ear plate 24 provided at the other end of the cover 2, a first fastening assembly, and a second fastening assembly; the first ear plate 13 is detachably fixedly connected with the third ear plate 23 through the first fastening assembly, and the second ear plate 14 is detachably fixedly connected with the fourth ear plate 24 through the second fastening assembly. In this way, the first fastening assembly can fix the first ear plate 13 and the third ear plate 23 to connect the base 1 and the cover 2, and the second fastening assembly can fix the second ear plate 14 and the fourth ear plate 24 to connect the base 1 and the cover 2.

[0060] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, the first fastening assembly comprises: a first assembly hole opened on the first ear plate 13, a third assembly hole opened on the third ear plate 23, a first screw 47 passing through the third assembly hole and being threadedly connected with the first assembly hole; the second fastening assembly comprises: a second assembly hole opened on the second ear plate 14, a fourth assembly hole opened on the fourth ear plate 24, a second screw passing through the fourth assembly hole and being threadedly connected with the second assembly hole. In this way, the first screw 47 can fix the first ear plate 13 and the third ear plate 23 after passing through the third assembly hole and being threadedly connected with the first assembly hole, and the second screw can fix the second ear plate 14 and the fourth ear plate 24 after passing through the fourth assembly hole and being threadedly connected with the second assembly hole.

[0061] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, the first ear plate 13, the second ear plate 14, the third ear plate 23, and the fourth ear plate 24 are flat plates, and the first ear plate 13, the second ear plate 14, the third ear plate 23, and the fourth ear plate 24 are arranged parallel to each other.

[0062] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, the annular groove 3 is circular. In this way, it is convenient for the flange to move position along the annular groove 3.

[0063] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, the surface of the first ear plate 13 is smoothly connected with the surface of the base 1, the surface of the second ear plate 14 is smoothly connected with the surface of the base 1, the surface of the third ear plate 23 is smoothly connected with the surface of the cover 2, and the surface of the fourth ear plate 24 is smoothly connected with the surface of the cover 2. In this way, an object is not easy to scratch when sliding along the first ear plate 13 (or the second ear plate 14) to the surface of the base 1, and an object is not easy to scratch when sliding along the third ear plate 23 (or the fourth ear plate 24) to the surface of the cover.

[0064] Further, please refer to Figures 1 to 6 , as a specific embodiment of the stretch device for the coupling provided by the present application, the number of the first mounting holes 12 and the first double-headed screw rods 41 is two respectively; the two first mounting holes 12 and the two first double-headed screw rods 41 correspond to each other one by one; the number of the second mounting holes 22 and the second double-headed screw rods 44 is two respectively; the two second mounting holes 22 and the two second double-headed screw rods 44 correspond to each other one by one.

[0065] Further, please refer to Figures 1 to 6As a specific embodiment of the stretching device for the coupling provided by the present application, the hole diameter of the first mounting hole 12 is the same as the outer diameter of the first double-end screw rod 41, and the hole diameter of the second mounting hole 22 is the same as the outer diameter of the second double-end screw rod 44. In this way, the base 1 is not easy to shake relative to the first double-end screw rod 41, and the cover 2 is not easy to shake relative to the second double-end screw rod 44.

[0066] Further, referring to Figures 1 to 6 As a specific embodiment of the stretching device for the coupling provided by the present application, the first double-end screw rod 41 and the second double-end screw rod 44 are arranged in parallel. In this way, the base 1 and the cover 2 are facilitated to slide along the first double-end screw rod 41 (or the second double-end screw rod 44).

[0067] Further, referring to Figures 1 to 6 As a specific embodiment of the stretching device for the coupling provided by the present application, the base 1 can move 3mm-4mm relative to the first double-end screw rod 41, and the cover 2 can move 3mm-4mm relative to the second double-end screw rod 44.

[0068] In one embodiment, the subject name can be: "displacement device for coupling"

[0069] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A tensioning device for a shaft coupling, characterized in that The utility model provides a kind of coupling, including: base, detachable fixed cover on the base, first double-end screw, second double-end screw, first nut, second nut, third nut and fourth nut;First U-shaped groove is opened on the top of the base, the bottom of the cover is opened with second U-shaped groove;The first U-shaped groove and the second U-shaped groove are enclosed to form the hole for shaft coupling to pass;The inner wall of the first U-shaped groove has first clamping groove, the inner wall of the second U-shaped groove has second clamping groove, the first clamping groove and the second clamping groove are communicated to form annular groove for flange on the outer surface of shaft coupling to be inserted;First mounting hole is opened on the base, the first double-end screw is threaded in the first mounting hole, the first nut is arranged at one end of the first double-end screw, and the second nut is arranged at the other end of the first double-end screw;Second mounting hole is opened on the cover, the second double-end screw is threaded in the second mounting hole, the third nut is arranged at one end of the second double-end screw, and the fourth nut is arranged at the other end of the second double-end screw; Further comprising: first lug plate arranged at one end of the base, second lug plate arranged at the other end of the base, third lug plate arranged at one end of the cover, fourth lug plate arranged at the other end of the cover, first fastening assembly and second fastening assembly;The first lug plate is detachably fixedly connected with the third lug plate through the first fastening assembly, and the second lug plate is detachably fixedly connected with the fourth lug plate through the second fastening assembly; The first fastening assembly comprises: first assembly hole opened on the first lug plate, third assembly hole opened on the third lug plate, first screw threaded through the third assembly hole and screwed with the first assembly hole; The second fastening assembly comprises: second assembly hole opened on the second lug plate, fourth assembly hole opened on the fourth lug plate, second screw threaded through the fourth assembly hole and screwed with the second assembly hole. The first lug plate, the second lug plate, the third lug plate and the fourth lug plate are respectively flat plates, and the first lug plate, the second lug plate, the third lug plate and the fourth lug plate are respectively arranged in parallel with each other.

2. The stretching device for a shaft coupling according to claim 1, wherein The surface of the first lug plate is smoothly connected with the surface of the base, the surface of the second lug plate is smoothly connected with the surface of the base, the surface of the third lug plate is smoothly connected with the surface of the cover, and the surface of the fourth lug plate is smoothly connected with the surface of the cover.

3. The stretching device for a shaft coupling according to claim 2, wherein The annular groove is circular.

4. The stretching device for a shaft coupling according to claim 1, wherein The number of the first mounting hole and the first double-end screw is two respectively;Two first mounting holes and two first double-end screws correspond one by one; 5. The stretching device for a shaft coupling according to claim 1, wherein The number of the second mounting hole and the second double-end screw is two respectively;Two second mounting holes and two second double-end screws correspond one by one. The hole diameter of the first mounting hole is the same as the outer diameter of the first double-end screw, and the hole diameter of the second mounting hole is the same as the outer diameter of the second double-end screw.

6. The stretching device for a shaft coupling according to claim 1, wherein The first double-end screw and the second double-end screw are arranged in parallel.

7. The stretching device for a shaft coupling according to claim 1, wherein ​ 8. The stretching device for a shaft coupling according to claim 1, wherein The base can move 3 mm ~ 4 mm relative to the first double-headed screw rod, and the cover can move 3 mm ~ 4 mm relative to the second double-headed screw rod.

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