Inflatable shaft structure

Abstract

The utility model discloses an inflatable shaft structure, which relates to the technical field of inflatable shafts and comprises an inflatable shaft, the inflatable shaft comprises an air inlet shaft provided with a through hole and an inflatable shaft body connected with the air inlet shaft, and a sliding plug capable of moving along the length direction of the inflatable shaft is arranged in the inflatable shaft body. The surface of the sliding plug comprises a plurality of conical bodies which are connected with one another, a plurality of conical planes are distributed on the surface of each conical body, the conical planes of the sliding plug abut against a plurality of expansion strips, and a plurality of inclined planes matched with the conical planes are arranged on the expansion strips. The expansion strip is a whole block and is composed of a plurality of inclined plane sections, the conical plane is machined on the sliding plug to be matched with the expansion strip in a sliding mode, the expansion strip directly moves on the conical plane of the sliding plug, only the planes of the two pieces make contact with each other, restraining force and resistance in other directions do not exist, and the expansion strip is smoother in the working process; in a working environment including material dust, the expansion strip and the sliding plug of the structure cannot be blocked.

Description

Technical Field

[0001] This utility model relates to the field of air shaft technology, specifically an air shaft structure. Background Technology

[0002] An air-expansion shaft is a specially designed winding and unwinding shaft. It's a shaft that, after being inflated under high pressure, has protruding parts on its surface to support and secure the winding core. After deflating, these protruding parts quickly retract. Current air-expansion shafts often use air bladders at the bottom of the inflating section for inflation. However, because there are usually multiple protrusions, it's difficult for them to protrude simultaneously during inflation. If the winding core is too thin, this can easily lead to core deformation and an unsightly finished product.

[0003] A utility model patent application with Chinese patent application number 2020219552601 discloses a gas expansion shaft tooling for a winding machine. After studying the prior art and the aforementioned patent, it was found that the expansion blocks in the prior art are separate and require a separate component for screw connection, resulting in insufficient smooth operation and potential dust accumulation that could clog the expansion bar and sliding plug. Therefore, this utility model proposes a gas expansion shaft structure. Utility Model Content

[0004] Technical problems to be solved

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an air shaft structure.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: an air shaft structure, comprising an air shaft, the air shaft including an intake shaft with a through hole and an air shaft body connected to the intake shaft, a sliding plug movable along the length of the air shaft being disposed within the air shaft body, the surface of the sliding plug including multiple interconnected cones, each cone having multiple conical planes distributed on its surface, the multiple conical planes of the sliding plug abutting against multiple expansion strips, the expansion strips having multiple inclined surfaces cooperating with the conical planes, a limit groove being provided at the end of the sliding plug away from the intake shaft, and the air shaft body being away from... One end of the intake shaft is connected to an end cap. The end of the sliding plug away from the intake shaft is provided with a spring mounting groove. A sliding plug return spring is provided in the spring mounting groove. Multiple expansion bars are provided with expansion bar return springs at both ends. The expansion bar of this utility model is a single piece, composed of multiple inclined sections. The sliding plug is machined with a conical plane that cooperates with the expansion bar to slide. The expansion bar moves directly on the conical plane of the sliding plug. There is only two planes in contact, without constraint or resistance in other directions, making the operation smoother. Moreover, since the sliding plug is conical in shape, material dust in the working environment will not cause blockage to the expansion bar and sliding plug of this structure.

[0008] Preferably, an expansion joint is fixedly connected to the outer side of the expansion strip.

[0009] Preferably, the expansion bar has limiting blocks at both ends that are fixedly connected to the air shaft body, and the expansion bar has mounting grooves for the expansion bar reset spring at both ends, with the limiting blocks abutting against the expansion bar reset spring.

[0010] Preferably, the number of expansion strips and expansion plates are three or more, and they are evenly distributed on the outside of the sliding plug.

[0011] Preferably, the surface of the sliding plug is provided with at least one cone-shaped body, and the expansion strip is provided with at least one inclined surface that cooperates with the cone plane.

[0012] Preferably, a sealing ring is provided at the end of the sliding plug near the intake shaft to prevent air leakage during intake and thus prevent it from affecting expansion.

[0013] Preferably, the air shaft body is provided with a limiting screw that cooperates with the limiting slot to prevent the sliding groove from rotating.

[0014] Beneficial effects:

[0015] Compared with existing technologies, this air shaft structure has the following advantages:

[0016] The expansion bar of this invention is a single piece, composed of multiple inclined sections, and the sliding plug has a conical surface machined on it to slide in cooperation with the expansion bar. The expansion bar moves directly on the conical surface of the sliding plug, with only the two parts in planar contact. There are no constraints or resistance in other directions, making the operation smoother. Furthermore, since the sliding plug is conical in shape, material dust in the working environment will not cause blockage to the expansion bar and sliding plug of this structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the intake shaft and the air expansion shaft body of this utility model;

[0021] Figure 4This is a schematic diagram of the structure of the sliding plug and expansion strip of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the sliding plug of this utility model;

[0023] Figure 6 This is a structural schematic diagram of another embodiment of the limiting screw and limiting slot of this utility model.

[0024] In the picture:

[0025] 1. Intake shaft; 2. Air shaft body; 3. Sliding plug; 4. Expansion bar; 5. Limiting groove; 6. End cap; 7. Spring mounting groove; 8. Sliding plug return spring; 9. Expansion bar return compression spring; 10. Expansion bearing; 11. Limiting pressure block; 12. Sealing ring; 13. Limiting screw; 301. Conical body; 302. Conical plane; 401. Inclined surface; 402. Mounting groove. Detailed Implementation

[0026] 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.

[0027] Please see Figures 1-6 As shown, this utility model provides a technical solution: an air shaft structure, including an air shaft, an air shaft 1 with a through hole and an air shaft body 2 connected to the air shaft 1, a sliding plug 3 movable along the length of the air shaft is provided inside the air shaft body 2, the surface of the sliding plug 3 includes a plurality of interconnected cone-shaped bodies 301, each cone-shaped body 301 has a plurality of cone-shaped surfaces 302 distributed on its surface, the plurality of cone-shaped surfaces 302 of the sliding plug 3 abut against a plurality of expansion strips 4, the expansion strips 4 are provided with a plurality of inclined surfaces 401 that cooperate with the cone-shaped surfaces 302, the end of the sliding plug 3 away from the air shaft 1 is provided with a limit groove 5, the end of the air shaft body 2 away from the air shaft 1 is provided with a limit groove 5. One end of the air shaft is connected to an end cap 6. The end of the sliding plug 3 away from the air intake shaft 1 is provided with a spring mounting groove 7. A sliding plug return spring 8 is provided in the spring mounting groove 7. Multiple expansion bars 4 are provided with expansion bar return springs 9 at both ends. The expansion bar 4 of this application is a single piece, composed of multiple inclined sections. The sliding plug 3 is machined with a conical plane 302 to cooperate with the expansion bar 4 for sliding. The expansion bar 4 moves directly on the conical plane 302 of the sliding plug 3. There is only plane contact between the two parts, and there is no constraint force or resistance in other directions, making the operation smoother. Moreover, since the sliding plug 3 is conical in shape, the material dust in the working environment will not cause blockage to the expansion bar 4 and the sliding plug 3 of this structure.

[0028] Please refer to the following carefully. Figure 2 , Figure 4 and Figure 5 The outer side of the expansion strip 4 is fixedly connected with the expansion pad 10. The two ends of the expansion strip 4 are provided with limiting pressure blocks 11 that are fixedly connected to the air expansion shaft body 2. The two ends of the expansion strip 4 are provided with mounting grooves 402 for the expansion strip return spring 9. The limiting pressure block 11 abuts against the expansion strip return spring 9. The number of expansion strips 4 and expansion pads 10 is three or more, and they are evenly distributed on the outer side of the sliding plug 3. The expansion strip 4 has small pieces and springs (expansion strip return spring 9) on the outer diameter of the shaft to provide support force, so that the expansion strip 4 fits against the sliding plug cone plane 302.

[0029] Please refer to the following carefully. Figure 2 and Figure 3 The sliding plug 3 has at least one cone-shaped body 301 on its surface, and the expansion strip 4 has at least one inclined surface 401 that mates with the cone plane 302. A sealing ring 12 is provided at one end of the sliding plug 3 near the intake shaft 1 to prevent air leakage during intake and affect expansion.

[0030] Please refer to the following carefully. Figure 2 and Figure 5 The air shaft body 2 is provided with a limiting screw 13 that cooperates with the limiting slot 5 to prevent the sliding groove from rotating. A slot (limiting groove and limiting screw) is machined on the sliding plug. The bolt limits or there is a hole on the end face of the sliding plug to limit from the side.

[0031] Working Principle: This air shaft is used for unwinding. As a mechanical air shaft used in unwinding equipment, the internal sliding plug 3 has a conical or flat surface. High-pressure air entering from one end of the air inlet shaft 1 pushes the sliding plug 3 towards the end cover 6. The sliding plug 3 pushes the expansion strip 4, which contacts the conical surface 302 of the sliding plug, upwards, thereby tightening the inner hole of the material to be unwound. When air is released from one end of the air inlet shaft 1, the return force of the sliding plug return spring 8 at one end of the sliding plug 3 begins to act, causing the sliding plug 3 to return to its original position towards the air inlet shaft 1. Simultaneously, the expansion strip return springs 9 at both ends of the expansion strip 4, under the action of the return force, cause the expansion strip 4 and the expansion bearing 10 to retract downwards and return to their original positions.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic shaft structure, characterized in that: The device includes an air shaft, which comprises an intake shaft (1) with a through hole and an air shaft body (2) connected to the intake shaft (1). A sliding plug (3) movable along the length of the air shaft is provided inside the air shaft body (2). The surface of the sliding plug (3) includes multiple interconnected cones (301), each cone (301) having multiple conical planes (302) distributed on its surface. The multiple conical planes (302) of the sliding plug (3) abut against multiple expansion strips (4). The strip (4) is provided with multiple inclined surfaces (401) that cooperate with the conical plane (302). The end of the sliding plug (3) away from the intake shaft (1) is provided with a limit groove (5). The end of the air expansion shaft body (2) away from the intake shaft is connected with an end cap (6). The end of the sliding plug (3) away from the intake shaft (1) is provided with a spring mounting groove (7). The sliding plug return spring (8) is provided in the spring mounting groove (7). The two ends of the multiple expansion strips (4) are provided with expansion strip return springs (9).

2. The air shaft structure according to claim 1, characterized in that: An expansion joint (10) is fixedly connected to the outside of the expansion strip (4).

3. The air shaft structure according to claim 1, characterized in that: The expansion bar (4) has limiting blocks (11) at both ends that are fixedly connected to the air shaft body (2). The expansion bar (4) has mounting grooves (402) for expansion bar reset springs (9) at both ends. The limiting blocks (11) abut against the expansion bar reset springs (9).

4. The air shaft structure according to claim 1, characterized in that: The number of expansion strips (4) and expansion tiles (10) are three or more, and they are evenly distributed on the outside of the sliding plug (3).

5. The air shaft structure according to claim 1, characterized in that: The surface of the sliding plug (3) is provided with at least one cone-shaped body (301), and the expansion strip (4) is provided with at least one inclined surface (401) that cooperates with the cone plane (302).

6. The air shaft structure according to claim 1, characterized in that: A sealing ring (12) is provided at one end of the sliding plug (3) near the intake shaft (1).

7. The air shaft structure according to claim 1, characterized in that: The air shaft body (2) is provided with a limiting screw (13) that cooperates with the limiting slot (5).

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