Expansion shaft device

Abstract

A tension shaft arrangement is provided. The expansion shaft device comprises a hollow shaft body and an expansion shaft, wherein the hollow shaft body is provided with a hollow part extending in the axial direction; the sliding rod is arranged in the hollow part of the hollow shaft body in a sliding manner along the axial direction; and at least one ejectable member which is assembled to the outer peripheral surface of the slide bar; wherein the sliding rod is configured to be capable of sliding between a first position and a second position relative to the hollow shaft body, at the first position, the ejectable component is attached to the outer circumferential surface of the sliding rod in the circumferential direction, and at the second position, the ejectable component is attached to the outer circumferential surface of the sliding rod in the circumferential direction. The ejectable member is ejected outward from an outer circumferential surface of the slide bar in the circumferential direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical equipment technical field especially relates to a kind of expansion shaft devices. BACKGROUND

[0002] The gas expansion shaft is a special winding and unwinding shaft. The traditional gas expansion shaft is made of an inner air bag and metal or rubber elastic sheet. After the air bag is inflated by high pressure, the metal or rubber elastic sheet arranged on the surface of the air bag expands radially outward, contacts and expands the inner wall of the winding drum to support and fix the winding drum. After the air bag is deflated, the metal or rubber elastic sheet arranged on the surface of the air bag shrinks radially inward to be taken out from the inside of the winding drum.

[0003] Due to long-term use in high-temperature working environment (for example, about 150℃-about 250℃), the traditional gas expansion shaft has problems such as air bag aging and / or rubber elastic sheet wear under high temperature, and short continuous service life. In addition, during use, the metal or rubber elastic sheet is prone to slipping due to insufficient friction between the metal or rubber elastic sheet and the winding drum product, and there is eccentricity problem due to non-ideal coaxiality, thereby affecting the stability and supporting force of the gas expansion shaft. SUMMARY

[0004] The utility model aims to solve at least one aspect of the above problems and defects in the prior art.

[0005] According to one aspect of the utility model, an expansion shaft device is provided, which comprises:

[0006] A hollow shaft body having a hollow portion extending in an axial direction;

[0007] A sliding rod slidably arranged in the hollow portion of the hollow shaft body in the axial direction; and

[0008] At least one ejectable member assembled to the outer peripheral surface of the sliding rod;

[0009] Wherein, the sliding rod is configured to be slidable relative to the hollow shaft body between a first position and a second position, at the first position, the ejectable member is attached to the outer peripheral surface of the sliding rod in a circumferential direction, and at the second position, the ejectable member is ejected outward from the outer peripheral surface of the sliding rod in the circumferential direction.

[0010] According to one embodiment of the utility model, the outer circumferential surface of the sliding rod is provided with barb structure, and the inner circumferential surface of the ejectable component is provided with barb structure receiving hole, wherein the barb structure is received in the barb structure receiving hole, and when the sliding rod is at the first position relative to the hollow shaft body, the barb structure is completely received in the barb structure receiving hole, and when the sliding rod is at the second position relative to the hollow shaft body, the barb structure is partially received in the barb structure receiving hole.

[0011] According to one embodiment of the utility model, the sliding rod comprises a first end portion and an opposite second end portion, and the barb structure extends obliquely from the outer circumferential surface of the sliding rod towards the second end portion.

[0012] According to one embodiment of the utility model, the oblique angle of the barb structure relative to the outer circumferential surface of the sliding rod is in the range of about 30 degrees to about 60 degrees.

[0013] According to one embodiment of the utility model, the first end portion of the sliding rod is provided with a return spring, one end of the return spring is abutted to the first end portion of the sliding rod, and the other end is abutted to the bottom wall of the hollow portion of the hollow shaft body, and the sliding rod has a top core, and the top core is arranged close to the second end portion of the sliding rod.

[0014] According to one embodiment of the utility model, the outer surface of the ejectable component is formed with a friction pattern.

[0015] According to one embodiment of the utility model, the at least one ejectable component comprises four ejectable components, and the four ejectable components are equally spaced in the circumferential direction on the outer circumferential surface of the sliding rod.

[0016] According to one embodiment of the utility model, the hollow shaft body is provided with a driving rod hole communicating with the hollow portion.

[0017] According to one embodiment of the utility model, the expansion shaft device further comprises a driving unit, and the driving unit has a driving rod, wherein the driving rod passes through the driving rod hole and is abutted to the top core of the sliding rod.

[0018] According to one embodiment of the utility model, the expansion shaft device further comprises a connecting rod, and the connecting rod is arranged between the driving unit and the hollow shaft body and has a connecting rod hole, wherein the driving rod of the driving unit passes through the connecting rod hole and the driving rod hole.

[0019] According to the foregoing various embodiments of the expanding shaft device of the utility model, since the constituent parts including the sliding rod and the ejectable component are all made of high-temperature-resistant metal parts, the expanding shaft device can be used for a long time in a high-temperature working environment (for example, about 150℃-about 250℃ or higher) and has a better service life compared with the traditional expanding shaft. In addition, the cooperation between the barb structure and the barb structure receiving hole between the sliding rod and the ejectable component solves the problem of insufficient friction between the metal or rubber elastic sheet and the winding drum product and the eccentric problem of the traditional expanding shaft, thereby improving the stability and support force during use. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure schematic diagram of the expanding shaft device according to the embodiment of the utility model, wherein the ejectable component is in the first position of retraction;

[0021] Figure 2 is a cross-sectional schematic diagram of Figure 1 ;

[0022] Figure 3 is a structure schematic diagram of the expanding shaft device according to the embodiment of the utility model, wherein the ejectable component is in the second position of expansion;

[0023] Figure 4 is a cross-sectional schematic diagram of Figure 3 ;

[0024] Figure 5 is an exploded structure schematic diagram of the expanding shaft device according to the embodiment of the utility model;

[0025] Figure 6 is an application state structure schematic diagram of the expanding shaft device according to the embodiment of the utility model. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be further specifically explained below through embodiments and in combination with the drawings. In the specification, the same or similar reference numerals indicate the same or similar parts. The following description of the embodiments of the utility model with reference to the drawings is intended to explain the overall general inventive concept of the utility model and should not be understood as a limitation of the utility model.

[0027] In the description of the embodiments of the utility model, the terms "upper", "lower", "right", and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, 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 a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0028] In addition, in the following detailed description, many specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. However, it is obvious that one or more embodiments can be implemented without these specific details. In other cases, well-known structures and devices are embodied in the form of illustrations to simplify the drawings.

[0029] The utility model provides a kind of expansion shaft device, it is mainly suitable for releasably supporting and fixed for example winding machine reel inside, it is the improvement scheme to traditional gas expansion shaft. Referring to Figures 1 to 6 According to an exemplary embodiment of the utility model, the embodiment, expansion shaft device 10 mainly includes: hollow shaft body 100, sliding rod 200 and at least one ejectable member 30. Hollow shaft body 100 has hollow portion 101 extending in axial direction, and at least one ejectable member 300 is assembled to the outer peripheral surface of sliding rod 200. According to the design concept of the utility model, sliding rod 200 is slidably arranged in the hollow portion 101 of hollow shaft body 100 along axial direction. Specifically, sliding rod 200 is configured to be able to slide between (as shown in Figure 1 And Figure 2 The second position (as shown in Figure 3 And Figure 4 ). Referring to Figure 1 And Figure 2 , at the first position, ejectable member 300 is attached to the outer peripheral surface of sliding rod 200 in circumferential direction. Referring to Figure 3 And Figure 4 , at the second position, ejectable member 300 is ejected outward from the outer peripheral surface of sliding rod 200 in circumferential direction to realize the support and fixation to the inner wall of target object such as winding machine reel. It should be noted that herein, axial direction refers to the direction extending along the length of hollow shaft body 100, and circumferential direction refers to the direction extending along the outer peripheral surface of hollow shaft body 100.

[0030] The expandable shaft device provided by the embodiment of the utility model, the hollow shaft body 100 and the sliding rod 200 can be made of, for example, high-strength alloy steel to ensure its durability and stability. The ejectable component 30 can be made of a metal spring made of, for example, lead-free brass material. In this way, since the constituent components including the sliding rod and the ejectable component are all made of high-temperature-resistant metal components, the device can be used for a long time in a high-temperature working environment (for example, about 150 DEG C to about 250 DEG C or higher temperature) and has a better service life compared with a conventional inflatable shaft.

[0031] As shown in Figures 1 to 6 According to the exemplary embodiment of the utility model, the sliding rod 200 includes a first end 201 and an opposite second end 202, and the outer periphery of the sliding rod 200 is provided with a barb structure 210, which extends obliquely from the outer periphery of the sliding rod 200 towards the second end 202. The oblique angle of the barb structure 210 relative to the outer periphery of the sliding rod 200 is in the range of about 30 degrees to about 60 degrees. Correspondingly, the inner periphery of the ejectable component 300 is provided with a barb structure receiving hole 310, and the barb structure 210 is slidably received in the barb structure receiving hole 310. According to the utility model, when the sliding rod 200 is at the first position relative to the hollow shaft body 100 (as shown in Figure 1 and Figure 2 ), the barb structure 210 is completely received in the barb structure receiving hole 310; and when the sliding rod 200 is at the second position relative to the hollow shaft body 100 (as shown in Figure 3 and Figure 4As shown), the barb structure 210 is partially received within the barb structure receiving hole 310. That is, according to the design concept of this utility model, the barb structure 210 on the sliding rod 200 is always received within the barb structure receiving hole 310 of the ejector member 300, and as the sliding rod 200 slides relative to the hollow shaft 100, the barb structure 210 is received within the barb structure receiving hole 310 to varying degrees. For example, when the sliding rod 200 is in the first position relative to the hollow shaft 100, the barb structure 210 is completely received within the barb structure receiving hole 310. At this time, the ejector member 300 abuts against the outer circumferential surface of the sliding rod 200 in the circumferential direction (i.e., the tensioning shaft device 10 is in a contracted state). For example, when the sliding rod 200 is in the second position relative to the hollow shaft 100, the barb structure 210 is partially received in the barb structure receiving hole 310. At this time, the ejectable member 300 is pushed outward from the outer periphery of the sliding rod 200 in the circumferential direction (that is, the tensioning shaft device 10 is in a tensioned state), which can contact and tighten the inner wall of the drum to support and fix the drum. The tensioning shaft device provided by this utility model embodiment adopts a barb structure and barb structure receiving hole cooperation method between the sliding rod and the ejectable member, which solves the problems of insufficient friction and easy slippage between the metal or rubber spring and the drum product and the eccentricity problem of traditional air expansion shafts, thereby improving the stability and support force during use. In addition, compared with traditional air expansion shafts, the barb structure and barb structure receiving hole cooperation method between the sliding rod and the ejectable member eliminates the need for lubricant and prevents contamination by lubricant and its by-products.

[0032] like Figures 1 to 6 (especially) Figure 5 As shown in the exemplary embodiment of the present invention, the tensioning shaft device 10 includes four ejectable members 300, which are evenly distributed on the outer peripheral surface of the sliding rod 200 in the circumferential direction. By distributing the multiple ejectable members 300 at equal intervals on the outer peripheral surface of the sliding rod 200 in the circumferential direction, eccentricity problems can be further avoided, thereby improving stability and support force during use. In addition, the outer surface of each ejectable member 300 is formed with a friction pattern, which increases the friction with the inner wall of the drum in the ejected state, thereby improving the stability of drum support and fixation.

[0033] Specifically, such as Figures 1 to 6 As shown, according to an exemplary embodiment of the present invention, a return spring 400 is provided at the first end 201 of the sliding rod 200. One end of the return spring 400 abuts against the first end 201 of the sliding rod 200, while the other end abuts against the bottom wall of the hollow portion 101 of the hollow shaft 100. For example, in... Figures 1 to 6In the example embodiment shown, when the hollow shaft body 100 includes the end cover 103, the other end of the return spring 400 abuts against the bottom wall of the end cover 103. At this time, the end cover 103 is fixed to the hollow shaft body 100 through the cooperation between the fastener 701 and the fixing ring 700.

[0034] In addition, as shown in the example embodiment, Figures 1 to 6 As shown, the sliding rod 200 has a top core 220 arranged close to the second end 201 of the sliding rod 200. Meanwhile, the hollow shaft body 100 is provided with a driving rod hole 102 communicating with the hollow portion 101. According to the utility model, the expansion shaft device 10 can further include some units and / or components used in cooperation. According to the example embodiment of the utility model, as shown, Figure 6 As shown, the expansion shaft device 10 further includes a driving unit 500 and a connecting rod 600. The driving unit 500 can be a driving cylinder and has a driving rod 510, wherein the driving rod 510 passes through the driving rod hole 102 and abuts against the top core 220 of the sliding rod 200. The connecting rod 600 is arranged between the driving unit 500 and the hollow shaft body 100 and has a connecting rod hole 601; wherein the driving rod 510 of the driving unit 500 passes through the connecting rod hole 601 and the driving rod hole 102.

[0035] In use, the hollow shaft body 100 together with the sliding rod 200 and the ejectable member 300 and other components arranged thereon extends into the inside of the reel. Under the driving of the driving unit 500, the end of the driving rod 510 abutting against the top core 220 of the sliding rod 200 pushes the sliding rod 200. At this time, the sliding rod 200 slides from the first position relative to the hollow shaft body 100 to the second position relative to the hollow shaft body 100 against the elastic force of the return spring 400. At this time, through the sliding of the barb structure 210 in the barb structure receiving hole 310, the ejectable member 300 is ejected outward from the outer peripheral surface of the sliding rod 200 in the circumferential direction and can contact and expand the inner wall of the reel to support and fix the reel. When it is needed to withdraw from the inside of the reel, the driving unit 500 stops working, and the sliding rod 200 slides from the second position relative to the hollow shaft body 100 back to the first position relative to the hollow shaft body 100 under the action of the elastic force accumulated when the return spring 400 is compressed. At this time, through the sliding of the barb structure 210 in the barb structure receiving hole 310, the ejectable member 300 is retracted back to the outer peripheral surface of the sliding rod 200 in the circumferential direction so that the hollow shaft body 100 together with the sliding rod 200 and the ejectable member 300 and other components arranged thereon can be smoothly withdrawn from the inside of the reel.

[0036] According to the expansion shaft device provided by the various embodiments of the utility model, since the constituent components including the sliding rod and the ejectable component are all high-temperature-resistant metal components, the expansion shaft device can be used for a long time in a high-temperature working environment (for example, a temperature of about 150 DEG C to about 250 DEG C or higher) and has a better service life compared with a traditional gas expansion shaft. In addition, the sliding rod and the ejectable component are matched by the barb structure and the barb structure receiving hole, which solves the problem of insufficient friction between the metal or rubber elastic sheet and the winding drum product and the eccentric problem of the traditional gas expansion shaft, thereby improving the stability and support force during use.

[0037] Although the utility model has been described in conjunction with the drawings, the embodiments disclosed in the drawings are intended to exemplarily illustrate the preferred embodiments of the utility model and cannot be understood as a limitation of the utility model.

[0038] Although some embodiments of the utility model have been shown and described, those skilled in the art will understand that changes can be made to these embodiments without departing from the principles and spirit of the utility model, and the scope of the utility model is limited by the claims and their equivalents.

Claims

1. A tensioning shaft device, characterized in that, The tensioning shaft device includes: A hollow shaft having a hollow portion extending in the axial direction; A sliding rod, slidably disposed in the hollow portion of the hollow shaft along the axial direction; and At least one ejectable member is fitted to the outer peripheral surface of the sliding rod; The sliding rod is configured to slide between a first position and a second position relative to the hollow shaft. In the first position, the ejectable member abuts against the outer circumferential surface of the sliding rod in the circumferential direction, while in the second position, the ejectable member is ejected outward from the outer circumferential surface of the sliding rod in the circumferential direction.

2. The tensioning shaft device according to claim 1, characterized in that, The outer circumferential surface of the sliding rod is provided with a barb structure; and The inner circumferential surface of the ejectable component is provided with a barbed receiving hole; The barb structure is received within the barb structure receiving hole; When the sliding rod is in the first position relative to the hollow shaft, the barb structure is completely received in the barb structure receiving hole; while when the sliding rod is in the second position relative to the hollow shaft, the barb structure is partially received in the barb structure receiving hole.

3. The tensioning shaft device according to claim 2, characterized in that, The sliding rod includes a first end and an opposite second end, and the barb structure extends obliquely from the outer peripheral surface of the sliding rod toward the second end.

4. The tensioning shaft device according to claim 3, characterized in that, The angle of inclination of the barb structure relative to the outer peripheral surface of the sliding rod is in the range of 30 degrees to 60 degrees.

5. The tensioning shaft device according to claim 3, characterized in that, A return spring is provided at the first end of the sliding rod, one end of which abuts against the first end of the sliding rod, and the other end abuts against the bottom wall of the hollow shaft; and The sliding rod has a top core, which is disposed near the second end of the sliding rod.

6. The tensioning shaft device according to claim 1, characterized in that, The outer surface of the ejectable component is formed with a friction pattern.

7. The tensioning shaft device according to any one of claims 1 to 6, characterized in that, The at least one ejectable member includes four ejectable members, which are distributed at equal intervals on the outer circumferential surface of the sliding rod in the circumferential direction.

8. The tensioning shaft device according to claim 5, characterized in that, The hollow shaft has a drive rod hole that communicates with the hollow part.

9. The tensioning shaft device according to claim 8, characterized in that, The tensioning shaft device further includes: a drive unit, the drive unit having a drive rod; The drive rod passes through the drive rod hole and abuts against the top core of the sliding rod.

10. The tensioning shaft device according to claim 9, characterized in that, The tensioning shaft device further includes a connecting rod, which is disposed between the drive unit and the hollow shaft and has a connecting rod hole; The drive rod of the drive unit passes through the connecting rod hole and the drive rod hole.

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