A lightweight expansion shaft for use

Abstract

The utility model discloses an expansion shaft of light weight uses, including outer end seat, the outer surface fixed mounting of outer end seat has the axle shell, the inside fixed mounting of axle shell has the inner shaft body, the outer surface of inner shaft body is equipped with the movable piston of activity, and the one end fixed mounting of piston is close to outer end seat has two groups of expansion shaft sleeve, and the expansion inclined plane of inwards recess is established to expansion shaft sleeve outer surface, and a plurality of expansion inclined planes are distributed through expansion shaft sleeve center dot equidistance circle, and the expansion key is contacted in every expansion inclined plane, and the bottom of expansion key is provided with the inclined plane structure of adaptation with expansion inclined plane, the utility model discloses through to the expansion shaft carries out the inflation and deflation work and can carry out normal axle body expansion and contraction processing, and in this way only needs through the inflation and deflation of outside inflation structure in use, need not be equipped with the cylinder structure of drive on own structure, through the use of simplifying cylinder structure, in this way can effectively reduce the overall weight and structure complexity of the utility model expansion shaft.

Description

Technical Field

[0001] This utility model relates to the field of expansion shaft technology, specifically to a lightweight expansion shaft. Background Technology

[0002] An expansion shaft (also known as an air shaft) is a specialized mechanical shaft that achieves rapid winding and unwinding through inflation. It is widely used in printing, coating, slitting, and rewinding machinery. Its core function is to control the expansion and contraction of the keyed strips or protrusions on the shaft surface by inflating and deflating the air, which can complete the fixing or release of the roll material within seconds.

[0003] Traditional expansion shafts are mostly driven by pneumatic cylinders. The expansion shaft is driven by the pneumatic cylinder, which increases the overall weight of the expansion shaft and the manufacturing cost due to the addition of the cylinder. It does not have the technical characteristics of being lightweight. Therefore, this utility model proposes an expansion shaft that is lightweight. Utility Model Content

[0004] The purpose of this invention is to provide a lightweight expansion shaft to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lightweight expansion shaft, comprising an outer end seat, a shaft housing fixedly mounted on the outer surface of the outer end seat, an inner shaft body fixedly mounted inside the shaft housing, a movable piston sleeved on the outer surface of the inner shaft body, two sets of tightening bushings fixedly mounted on one end of the piston near the outer end seat, an inwardly recessed tightening slope on the outer surface of the tightening bushing, a plurality of tightening slopes being circumferentially distributed at equal intervals through the center point of the tightening bushing, a tightening key contacting each tightening slope, a slope structure adapted to the tightening slope being provided at the bottom end of the tightening key, and a plurality of return springs fixedly mounted on the outer surface of the tail end of the tightening bushing.

[0006] Preferably, the end of the return spring away from the tension key is fixedly connected to the outer end seat.

[0007] Preferably, a recessed air valve is installed on the outer surface of the shaft housing.

[0008] Preferably, each of the expansion keys is slidably connected to the shaft housing, and each of the expansion keys has an outer groove on its outer surface.

[0009] Preferably, a spring strip is bound between the outer grooves of the plurality of expansion keys.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] Unlike traditional expansion shafts, this invention features an expansion shaft that is in a contracted state when inflated and a return spring that returns it to a tightened state when deflated. Under normal use, the expansion shaft remains in a tightened state, providing a certain degree of counter-force. The tightening is achieved through the spring's rebound force, resulting in a simpler structure and greater ease of use.

[0012] This invention allows for normal shaft expansion and contraction by simply inflating and deflating the expansion shaft. Therefore, during use, inflation and deflation are achieved only through an external inflation structure, eliminating the need for a driving cylinder within the shaft itself. By simplifying the cylinder design, the overall weight and structural complexity of the expansion shaft are effectively reduced, resulting in a lightweight and convenient product. This also significantly reduces production costs and makes the structure more user-friendly. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external three-dimensional structure of the expansion shaft according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the internal structure of the shaft housing according to an embodiment of the present utility model;

[0015] Figure 3 This is a three-dimensional enlarged structural diagram of the tail end of the inner shaft in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the expansion shaft according to an embodiment of the present invention;

[0017] Figure 5 This is an embodiment of the present utility model. Figure 1 A magnified structural diagram of region A.

[0018] In the diagram: 1. Outer end seat; 2. Shaft housing; 3. Inner shaft body; 4. Piston; 5. Expansion sleeve; 6. Expansion inclined surface; 7. Expansion key; 8. Air valve; 9. Outer groove; 10. Spring bar; 11. Return spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Please see Figure 1-5 One embodiment of this utility model is a lightweight expansion shaft, including an outer end seat 1, a shaft housing 2 fixedly installed on the outer surface of the outer end seat 1, and an inner shaft body 3 fixedly installed inside the shaft housing 2.

[0023] In this embodiment, a movable piston 4 is sleeved on the outer surface of the inner shaft body 3. Two sets of expansion sleeves 5 are fixedly installed on the end of the piston 4 near the outer end seat 1. The outer surface of the expansion sleeve 5 is provided with an inwardly recessed expansion slope 6. Several expansion slopes 6 are circumferentially distributed at equal intervals through the center point of the expansion sleeve 5. Each expansion slope 6 is in contact with an expansion key 7. Each expansion key 7 is slidably connected to the shaft housing 2. The bottom end of the expansion key 7 is provided with an inclined structure adapted to the expansion slope 6. Several return springs 11 are fixedly installed on the outer surface of the tail end of the expansion sleeve 5. The end of the return spring 11 away from the expansion key 7 is fixedly connected to the outer end seat 1.

[0024] Furthermore, a recessed air valve 8 is installed on the outer surface of the shaft housing 2;

[0025] Based on the above structure, this utility model can inflate the expansion shaft using the provided air valve 8. See the appendix of the instruction manual for details. Figure 5As shown, when the air valve 8 is inflated, the air drives the piston 4 to move from right to left, that is, the piston 4 moves towards one end of the outer end seat 1. When the piston 4 moves from right to left, the piston 4 will synchronously drive the expansion sleeve 5 to move. During the process of the expansion sleeve 5 moving from right to left, the expansion inclined surface 6 of the expansion sleeve 5 no longer pushes the expansion key 7. At this time, the expansion key 7 retracts into the shaft housing 2, and the expansion shaft is in a contracted state.

[0026] During the movement of the expansion sleeve 5 from right to left, it compresses the return spring 11 at the tail end, so that the return spring 11 is in a compressed state. When it is necessary to tighten the expansion shaft, the air valve 8 releases air. After the expansion shaft is released, the return spring 11, which is in a compressed state, can elastically return to its original state. In this way, the elastic return of the return spring 11 can abut against the expansion sleeve 5, so that the expansion sleeve 5 and the piston move from left to right. During the movement of the expansion sleeve 5 from left to right, it can abut against the expansion member 7 through the expansion inclined surface 6, so that the expansion member 7 extends out from the shaft housing 2. At this time, the expansion shaft of this utility model is in a tightened state.

[0027] According to the above description, the difference between this utility model and the traditional expansion shaft is that the expansion shaft of this utility model is in a contracted state when it is inflated, and when the expansion shaft is deflated, the return spring returns to the original state, so that the expansion shaft is in a tightened state. Under normal use, the expansion shaft is continuously in a tightened state, which has a certain reaction effect. It can be tightened by the spring's rebound force, making the structure simpler and more convenient to use.

[0028] This invention allows for normal shaft expansion and contraction by simply inflating and deflating the expansion shaft. Therefore, inflation and deflation can be achieved solely through an external inflation mechanism, eliminating the need for a driving cylinder within the shaft itself. This simplification of the cylinder structure effectively reduces the overall weight and structural complexity of the expansion shaft, resulting in a lightweight and convenient design. It also lowers production costs and makes the structure simpler and more convenient to use.

[0029] In this embodiment, in order to reset the expansion key 7 and prevent it from falling out of the shaft housing 2, please refer to the specification 1 and... Figure 5 As shown, each expansion key 7 has an outer groove 9 on its outer surface. A spring strip 10 is bound between the outer grooves 9 of several expansion keys 7. The spring strip 10 can tighten several expansion keys 7 to prevent them from falling out of the shaft housing 2.

[0030] At the same time, when the expansion key 7 extends and expands, it can stretch the spring bar 10. The stretched spring bar 10 can provide a certain inward tightening force when the expansion key 7 retracts inward, thereby helping the expansion key 7 to retract into the shaft housing 2 and complete the retraction and reset of the expansion key 7.

[0031] Working principle: When the expansion shaft of this utility model is in use, it can be installed on an external structure through the provided outer end seat 1, thereby ensuring its normal use effect.

[0032] This utility model allows the expansion shaft to be inflated via the air valve 8. See the attached instruction manual for details. Figure 5 As shown, when the air valve 8 is being inflated, the air drives the piston 4 to move from right to left, that is, the piston 4 moves towards one end of the outer end seat 1. When the piston 4 moves from right to left, the piston 4 will simultaneously drive the expansion sleeve 5 to move. During the process of the expansion sleeve 5 moving from right to left, the expansion inclined surface 6 of the expansion sleeve 5 no longer pushes the expansion key 7. At this time, the expansion key 7 retracts into the shaft housing 2, and the expansion shaft is in a contracted state.

[0033] During the movement of the expansion sleeve 5 from right to left, it compresses the return spring 11 at the tail end, so that the return spring 11 is in a compressed state. When it is necessary to tighten the expansion shaft, the air valve 8 releases air. After the expansion shaft is released, the return spring 11, which is in a compressed state, can elastically return to its original state. In this way, the elastic return of the return spring 11 can abut against the expansion sleeve 5, so that the expansion sleeve 5 and the piston 4 move from left to right. During the movement of the expansion sleeve 5 from left to right, it can abut against the expansion member 7 through the expansion inclined surface 6, so that the expansion member 7 extends out from the shaft housing 2. At this time, the expansion shaft of this utility model is in a tightened state.

[0034] According to the above description, the difference between this utility model and the traditional expansion shaft is that the expansion shaft of this utility model is in a contracted state when it is inflated, and when the expansion shaft is deflated, the return spring returns to the original state, so that the expansion shaft is in a tightened state. Under normal use, the expansion shaft is continuously in a tightened state, which has a certain reaction effect. It can be tightened by the spring's rebound force, making the structure simpler and more convenient to use.

[0035] This invention allows for normal shaft expansion and contraction by simply inflating and deflating the expansion shaft. Therefore, inflation and deflation can be achieved solely through an external inflation mechanism, eliminating the need for a driving cylinder within the shaft itself. This simplification of the cylinder structure effectively reduces the overall weight and structural complexity of the expansion shaft, resulting in a lightweight and convenient design. It also lowers production costs and makes the structure simpler and more convenient to use.

[0036] At the same time, it should be noted that the expansion shaft of this utility model has its tensioning force coming from the compression and rebound force of the return spring 11. Therefore, in actual use, it has the effect of being suitable for light-weight products and can only complete the tensioning and material transfer work of light-weight products. It cannot be used for tensioning heavier materials.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A lightweight expansion shaft, comprising an outer end seat (1), characterized in that, A shaft housing (2) is fixedly installed on the outer surface of the outer end seat (1). An inner shaft body (3) is fixedly installed inside the shaft housing (2). A movable piston (4) is sleeved on the outer surface of the inner shaft body (3). Two sets of expansion sleeves (5) are fixedly installed on one end of the piston (4) near the outer end seat (1). An inwardly recessed expansion slope (6) is opened on the outer surface of the expansion sleeve (5). Several expansion slopes (6) are circumferentially distributed at equal intervals through the center point of the expansion sleeve (5). An expansion key (7) is contacted in each expansion slope (6). The bottom end of the expansion key (7) is provided with a slope structure that matches the expansion slope (6). Several return springs (11) are fixedly installed on the outer surface of the tail end of the expansion sleeve (5).

2. The lightweight expansion shaft according to claim 1, characterized in that: The end of the return spring (11) away from the tension key (7) is fixedly connected to the outer end seat (1).

3. The lightweight expansion shaft according to claim 1, characterized in that: An indented air valve (8) is installed on the outer surface of the housing (2).

4. The lightweight expansion shaft according to claim 1, characterized in that: Each of the expansion keys (7) is slidably connected to the shaft housing (2), and each of the expansion keys (7) has an outer groove (9) on its outer surface.

5. The lightweight expansion shaft according to claim 1, characterized in that: A spring strip (10) is bound between the outer grooves (9) of several of the aforementioned expansion keys (7).

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