High output pneumatic multi-stage expansion shaft

Abstract

The utility model discloses a high output pneumatic multistage expansion axle, including cylinder barrel, the inside of cylinder barrel is provided with piston rod, the top end outside fixed mounting of piston rod has not less than three pistons, the top end outside surface of cylinder barrel is installed the axle cylinder, the tail end of piston rod and located inside fixed connection of axle cylinder has the expansion top axle, is equipped with a plurality of key strip recesses on the outer surface of expansion top axle, each key strip recess is provided with a plurality of jacking wedges, and the upper end surface of jacking wedge is inclined plane, and each key strip recess all is provided with expansion key strip, and the lower surface fixed mounting of expansion key strip has the lower wedge block of adaptation with jacking wedge block, the utility model discloses have the practical use effect of high output expansion, by improving the output force of pneumatic cylinder, thereby can effectively improve the output expansion force of utility model expansion axle, by the expansion force of high output, make the expansion axle of utility model can be used in the use scene of high load expansion, has the practical use characteristic of high output, high load expansion.

Description

Technical Field

[0001] This utility model relates to the field of expansion shaft technology, specifically a high-output pneumatic multi-stage expansion shaft. Background Technology

[0002] An expansion shaft (also known as an air shaft) is a special mechanical shaft that achieves rapid winding and unwinding by inflating with air. It is widely used in printing, coating, slitting, rewinding and other mechanical equipment, and is mainly used for fixing and releasing roll materials (such as paper tubes, films, etc.).

[0003] The prior art CN201620355869.2 discloses a high-precision pneumatic tensioning shaft, which includes a cylindrical tensioning shaft body and a key bar assembly. The key bar assembly includes a plurality of tensioning key bars evenly distributed radially along the tensioning shaft body. The tensioning key bars pass through the tensioning shaft body and are slidably connected to it. A shaft head is fixed at the end of the tensioning shaft body. The shaft head is hollow and tubular. A central air tube passes through the tensioning shaft body. The central air tube is connected to the shaft head and the two are interconnected. A piston is sleeved between the central air tube and the tensioning shaft body and on the central air tube. A compression spring is provided at one end of the piston, which causes the piston to slide elastically by means of the compression spring.

[0004] Existing technology enables the core and the tensioning shaft to remain coaxial, making it suitable for high-speed equipment and greatly improving production efficiency. However, in actual use, the overall output tensioning force of the existing tensioning shaft is insufficient, making it unsuitable for high-load tensioning working environments and limiting its application. Therefore, this utility model proposes a high-output pneumatic multi-stage tensioning shaft. Utility Model Content

[0005] The purpose of this invention is to provide a high-output pneumatic multi-stage expansion shaft to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-output pneumatic multi-stage expansion shaft, comprising a cylinder, a piston rod disposed inside the cylinder, at least three pistons fixedly mounted on the top of the piston rod, a shaft sleeve mounted on the outer surface of the top of the cylinder, and a tensioning top shaft fixedly connected to the tail end of the piston rod inside the shaft sleeve. A plurality of keyway grooves are formed on the outer surface of the tensioning top shaft, and a plurality of lifting wedges are disposed in each keyway groove. The upper end face of each lifting wedge is inclined, and a tensioning key is disposed in each keyway groove. A lower wedge adapted to the lifting wedge is fixedly mounted on the lower surface of the tensioning key.

[0007] Preferably, the keyway grooves are circumferentially distributed at equal intervals around the center point of the expansion top shaft, and the expansion top shaft and the lifting wedge are integrally formed.

[0008] Preferably, the expansion key strip and the lower wedge are integrally formed, and the outer surface of the expansion key strip is provided with a plurality of anti-slip protrusions.

[0009] Preferably, a return spring is fixedly connected to the tail end of the tensioning top shaft, and the tail end of the return spring is fixedly connected to the inner bottom wall of the shaft cylinder.

[0010] Preferably, a cylinder body connector is fixedly installed at the top end of the cylinder barrel.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention features at least three sets of pistons inside the cylinder. By increasing the number of pistons, the overall output force of the cylinder can be effectively improved. Three or more sets of pistons can expand the effective working area, thereby obtaining a greater output force under the same system pressure. This results in a high-output tightening effect. By increasing the output force of the cylinder, the output tightening force of the expansion shaft of this invention can be effectively increased. The high output tightening force allows the expansion shaft of this invention to be used in high-load tightening scenarios, exhibiting high-output and high-load tightening characteristics. This significantly improves the tightening output force, resulting in better practical performance and meeting the needs of more high-load scenarios, effectively reducing usage limitations. 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 utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the cylinder in an embodiment of the present utility model;

[0015] Figure 3 This is a three-dimensional schematic diagram of the outer surface of the expansion top shaft according to an embodiment of the present invention;

[0016] Figure 4 This is a cross-sectional structural diagram of the internal assembly of the expansion shaft according to an embodiment of the present invention.

[0017] In the diagram: 1. Cylinder; 2. Piston rod; 3. Piston; 4. Expansion pin; 5. Keyway groove; 6. Lifting wedge; 7. Expansion keyway; 8. Lower wedge; 9. Return spring; 10. Cylinder body connector; 11. Shaft. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Please see Figure 1-4 This utility model provides an embodiment of a high-output pneumatic multi-stage expansion shaft, including a cylinder 1, a piston rod 2 inside the cylinder 1, and at least three pistons 3 fixedly installed on the top of the piston rod 2. A cylinder body connector 10 is fixedly installed on the top of the cylinder 1. A pneumatic cylinder structure can be assembled by the cylinder 1, piston rod 2, pistons 3 and cylinder body connector 10. By introducing compressed air into the cylinder body connector 10, the pressure can be converted into mechanical energy, so that the pistons 3 can drive the piston rod 2 to perform reciprocating linear motion. This is the basic working principle of the pneumatic cylinder, which will not be described in detail in this specification.

[0022] Furthermore, a shaft cylinder 11 is installed on the outer surface of the top end of the cylinder 1, and a tensioning top shaft 4 is fixedly connected to the tail end of the piston rod 2 inside the shaft cylinder 11. Several key grooves 5 are opened on the outer surface of the tensioning top shaft 4, and several lifting wedges 6 are provided in each key groove 5. The upper end face of the lifting wedge 6 is inclined, and a tensioning key 7 is provided in each key groove 5. A lower wedge 8 that matches the lifting wedge 6 is fixedly installed on the lower surface of the tensioning key 7.

[0023] For details regarding this structural design, please refer to the appendix of the instruction manual. Figure 4 As shown, when the piston 3 drives the piston rod 2 to extend from left to right, the piston rod 2 can simultaneously push the top of the tensioning shaft 4. Since the key groove 5 of the tensioning shaft 4 is provided with several lifting wedges 6, when the tensioning shaft 4 moves, it can simultaneously drive the lifting wedges 6 to move. When the lifting wedges 6 move from left to right, they can abut against the lower wedge 8 below the tensioning key 7. In this way, through the structural cooperation between the lower wedge 8 and the lifting wedge 6, the tensioning key 7 can be lifted and moved upward, thereby completing the movement and tensioning work of the tensioning key 7 and ensuring the normal use of the tensioning shaft of this utility model.

[0024] In this embodiment, an elastic rubber ring is sleeved between several expansion key bars 7, so that the expansion key bars 7 can be limited by the rubber ring to prevent them from falling off. In order to ensure the mobility of the expansion key bars 7, the expansion key bars 7 are in sliding contact with the shaft cylinder 11.

[0025] In this embodiment, several key grooves 5 are circumferentially distributed at equal intervals through the center point of the expansion top shaft 4. In order to improve the overall structure, the expansion top shaft 4 and the lifting wedge 6 are integrally formed.

[0026] In this embodiment, the expansion key 7 and the lower wedge 8 are integrally formed. The outer surface of the expansion key 7 is provided with a number of anti-slip protrusions. The anti-slip protrusions can contact the external structure to improve the anti-slip contact effect and improve the stability of expansion.

[0027] In this embodiment, a return spring 9 is fixedly connected to the tail end of the tensioning top shaft 4. The tail end of the return spring 9 is fixedly connected to the inner bottom wall of the shaft cylinder 11. With this structural design, when the tensioning top shaft 4 moves from left to right, it can compress the return spring 9 at the tail end. When the tensioning shaft is not working, the compressed return spring 9 can be elastically reset, thereby driving the tensioning top shaft to perform displacement reset through the spring.

[0028] Working principle: When the expansion shaft of this utility model is in use, compressed air is introduced into the cylinder joint 10 to convert pressure into mechanical energy, so that the piston 3 can drive the piston rod 2 to perform reciprocating linear motion.

[0029] For details, please refer to the appendix of the instruction manual. Figure 4As shown, when the piston 3 drives the piston rod 2 to extend from left to right, the piston rod 2 can simultaneously push the top of the tensioning shaft 4. Since the key groove 5 of the tensioning shaft 4 is provided with several lifting wedges 6, when the tensioning shaft 4 moves, it can synchronously drive the lifting wedges 6 to move. When the lifting wedges 6 move from left to right, they can abut against the lower wedge 8 below the tensioning key 7. In this way, through the structural cooperation between the lower wedge 8 and the lifting wedge 6, the tensioning key 7 can be lifted and moved upward, thereby completing the movement and tensioning work of the tensioning key 7 and ensuring the normal use of the tensioning shaft of this utility model.

[0030] This invention utilizes at least three sets of pistons 3 inside the cylinder 1. By increasing the number of pistons 3, the overall output force of the cylinder can be effectively increased. Three or more sets of pistons 3 can expand the effective working area, thereby achieving a greater output force under the same system pressure. This results in a high-output, tightening effect in practical applications. The formula for calculating the output force of the pneumatic cylinder is F = P × A (pressure × area). When the system pressure remains constant, increasing the number of pistons, i.e., increasing the total working area, can directly increase the output force.

[0031] This invention effectively increases the output tension force of the expansion shaft by increasing the output force of the cylinder. The high output tension force allows the expansion shaft to be used in high-load tensioning scenarios, exhibiting high output and high-load tensioning characteristics. This significantly improves the tensioning output force, resulting in better practical performance and meeting the needs of more high-load scenarios, effectively reducing usage limitations.

[0032] 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 high-output pneumatic multi-stage expansion shaft, comprising a cylinder (1), characterized in that, The cylinder (1) is provided with a piston rod (2) inside. At least three pistons (3) are fixedly installed on the top of the piston rod (2). A shaft cylinder (11) is installed on the outer surface of the top of the cylinder (1). A tensioning top shaft (4) is fixedly connected to the tail end of the piston rod (2) inside the shaft cylinder (11). Several key grooves (5) are opened on the outer surface of the tensioning top shaft (4). Several lifting wedges (6) are provided in each key groove (5). The upper end surface of the lifting wedge (6) is inclined. A tensioning key (7) is provided in each key groove (5). A lower wedge (8) adapted to the lifting wedge (6) is fixedly installed on the lower surface of the tensioning key (7).

2. The high-output pneumatic multi-stage expansion shaft according to claim 1, characterized in that: Several key grooves (5) are circumferentially distributed at equal intervals through the center point of the expansion top shaft (4), and the expansion top shaft (4) and the lifting wedge (6) are integrally formed.

3. The high-output pneumatic multi-stage expansion shaft according to claim 1, characterized in that: The expansion key (7) and the lower wedge (8) are integrally formed, and the outer surface of the expansion key (7) is provided with several anti-slip protrusions.

4. The high-output pneumatic multi-stage expansion shaft according to claim 1, characterized in that: The tail end of the tensioning top shaft (4) is fixedly connected to a return spring (9), and the tail end of the return spring (9) is fixedly connected to the inner bottom wall of the shaft cylinder (11).

5. A high-output pneumatic multi-stage expansion shaft according to claim 1, characterized in that: The top end of the cylinder (1) is fixedly installed with a cylinder body connector (10).

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