Mechanical inflatable shaft
By adopting a design in which the piston and key bar wedge angle match in a mechanical pneumatic shaft, combined with an induction ring and a measuring rod structure, the problem of inaccurate state judgment in the existing technology is solved, and more reliable state detection and improved insertion performance are achieved.
Patent Information
- Application Number
- CN202422905239.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing mechanical pneumatic shafts use a compressed gas pipeline's on/off valve to determine their status, which has a low reliability and increases the risk of coils falling.
The piston in the shaft tube and the key wedge angle are matched, and the state of the pneumatic shaft is directly judged through the induction ring and measuring rod structure. The insertion performance is improved by combining the introduction slope and guide roller to achieve more accurate state detection.
It achieves more reliable and direct judgment of the state of the air shaft, reduces the risk of the coil falling, and improves the introduction performance of the inserted roll.
Smart Images
Figure CN223328793U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of reel positioning, and more particularly to a mechanical inflatable shaft. Background Art
[0002] Conventional expansion shafts on the market mainly include three categories: airbag expansion shafts, piston-inflated mechanical expansion shafts, and mechanical expansion shafts. Among them, the inflatable mechanical expansion shaft (also called mechanical air expansion shaft) is inflated to expand and deflated to retract, and requires the use of compressed air as power.
[0003] In many special occasions, the load and runout of the airbag-type air expansion shaft do not meet the use requirements, and a piston-inflated mechanical expansion shaft is required.
[0004] Piston-type pneumatic mechanical expansion shafts use inflation and deflation to control the extension and retraction of the key bar. However, simply determining the status of the expansion shaft by controlling the on / off valve of the compressed air pipeline is unreliable. If the cylinder shaft malfunctions and leaks, relying on this method can cause production accidents such as coil drop. A more reliable and direct mechanical expansion shaft that can determine the extension / retraction status is needed. Summary of the Invention
[0005] The utility model overcomes the shortcoming of the existing mechanical inflatable shaft that the state is judged only by the on-off valve of the compressed gas pipeline, which has low reliability, and provides a mechanical inflatable shaft that can judge the state of the inflatable shaft more accurately and directly.
[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:
[0007] A mechanical pneumatic shaft comprises a shaft tube and a shaft rod. The shaft tube is connected to a plurality of key strips in a radially sliding manner. A piston that can slide in the axial direction of the shaft tube is provided in the shaft tube. The bottom wedge angles of the piston and the key strips cooperate. In the axial direction, elastic parts and piston cavities are respectively provided on both sides of the shaft tube. The shaft rod is provided with an airway and a detection hole. The airway communicates with the piston cavity. The detection hole is arranged along the axial direction of the shaft rod. A measuring rod is provided in the detection hole. The measuring rod is fixedly connected to the piston. An induction ring is slidably provided on the shaft rod. The induction ring is fixedly connected to the measuring rod. The position of the measuring rod is detected by the induction ring to judge the state of the pneumatic shaft.
[0008] The key strip on the shaft tube cooperates with the wedge angle of the piston, and the key strip extends radially as the piston moves axially, and the expansion force is amplified in this process.
[0009] The piston's two sides exert opposing forces through elastic elements and the piston chamber, respectively. The piston moves based on the combined force. Because the position of the piston and the expansion key are directly related, accurately determining the expansion key's status by measuring the piston's position can be used to accurately determine the expansion key's status. Therefore, determining the piston's position by monitoring a measuring rod fixed to the piston provides a more accurate and direct way to determine the inflatable shaft's status.
[0010] Preferably, the shaft is provided with an oblong hole, the major axis of the oblong hole being arranged along the longitudinal direction. The induction ring is fixedly connected to the measuring rod via a positioning pin, which passes through the oblong hole. The shaft is provided with a positioning pin at a position corresponding to the detection hole at the stroke limit of the piston, and the position of the measuring rod is determined by the induction ring via the positioning pin. This structure improves detection accuracy.
[0011] Preferably, the piston is a hollow structure, which reduces the moment of inertia and the torque required for rotation or braking.
[0012] Preferably, the elastic members are arranged at equal intervals around the axis of the piston.
[0013] Preferably, one end of the axle tube away from the shaft rod is provided with an introduction slope. Said structure provides guidance for the axle tube to be inserted into the reel.
[0014] Preferably, the shaft tube is provided with a guide roller on the inclined surface corresponding to the introduction slope, so as to convert static friction into dynamic friction and further reduce the resistance of the introduction reel.
[0015] Preferably, the top of the key bar is provided with friction grooves. Said structure increases the resistance of the key bar to the reel.
[0016] Preferably, under normal pressure, the top of the key strip is flush with the side wall of the shaft tube.
[0017] Preferably, a plurality of guide rollers are provided between adjacent key strips.
[0018] Preferably, a pressure plate is fixedly connected to the shaft tube, and a portion of the pressure plate is pressed onto the top of the key bar, and a return spring is provided between the key bar and the pressure plate. When the piston is reset, the key bar is pulled back to be flush with the surface of the shaft tube by the return spring.
[0019] Compared with the prior art, the present invention has the following advantages: (1) the key bar state is directly detected by the structure of the induction ring and the measuring rod, and the key bar extension / retraction state can be directly judged; (2) the introduction performance of the shaft tube into the reel is improved by arranging the introduction slope and the guide roller structure on the surface of the shaft tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a cutaway schematic diagram of the present utility model;
[0021] Figure 2 It is a cross-sectional schematic diagram of another angle of the present invention;
[0022] Figure 3 It is a three-dimensional diagram of the utility model;
[0023] Figure 4 It is a schematic diagram of the enlarged wedge angle of the present invention;
[0024] In the picture:
[0025] Shaft tube 1, shaft 2, key bar 3, piston 4, elastic part 5, piston chamber 6, airway 7, measuring rod 8, induction ring 9, detection hole 10, positioning pin 11, introduction slope 12, guide roller 13, friction pattern 14, pressure plate 15, return spring 16, tail cover 17, shaft sleeve 18, front support plate 19, rear support plate 20, oblong hole 21. DETAILED DESCRIPTION
[0026] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.
[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.
[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0029] In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are merely relational words determined for the convenience of describing the structural relationships of the various parts or elements of the present disclosure, and do not specifically refer to any part or element in the present disclosure, and should not be understood as limitations on the present disclosure.
[0030] In this disclosure, terms such as "fixed connection," "connected," and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meaning of these terms in this disclosure based on specific circumstances, and they should not be construed as limiting this disclosure.
[0031] Example:
[0032] A mechanical air shaft, Figures 1 to 3 As shown, it includes a shaft tube 1 and a shaft rod 2. The shaft tube 1 is connected to a plurality of key strips 3 in a radial sliding manner. A piston 4 that can slide along the axial direction of the shaft tube 1 is provided in the shaft tube 1. The bottom wedge angles of the piston 4 and the key strip 3 are matched. In the axial direction, elastic parts 5 and piston cavities 6 are respectively provided on both sides of the shaft tube 1. The shaft rod 2 is provided with an airway 7 and a detection hole 10. The airway 7 is connected to the piston cavity 6. The detection hole 10 is arranged along the axial direction of the shaft rod 2. A measuring rod 8 is provided in the detection hole 10. The measuring rod 8 is fixedly connected to the piston 4. An induction ring 9 is slidingly provided on the shaft rod 2. The induction ring 9 is fixedly connected to the measuring rod 8. The position of the measuring rod 8 is detected by the induction ring 9 to judge the state of the inflatable shaft.
[0033] Ginseng Figure 3 Specifically, the shaft 2 is provided with an oblong hole 21, the major axis of which runs along the longitudinal direction. The induction ring 9 is fixedly connected to the measuring rod 8 via a locating pin 11, which passes through the oblong hole 21. The shaft 2 is provided with a locating pin 11 at the position corresponding to the detection hole 10 at the stroke limit of the piston 4. The induction ring 9 determines the position of the measuring rod 8 via the locating pin 11. This structure improves detection accuracy. The elastic members 5 are arranged at equal intervals around the axis of the piston 4.
[0034] The end of the shaft tube 1, away from the shaft 2, is provided with an inclination 12. This structure provides guidance for the shaft tube 1 as it is inserted into the reel. Guide rollers 13 are installed on the inclined surface of the shaft tube 1 corresponding to the inclination 12. This converts static friction into dynamic friction, further reducing the resistance to the reel insertion. Several guide rollers 13 are positioned between adjacent key bars 3.
[0035] In some embodiments, the top of the key bar 3 is provided with friction grooves 14. Such a structure increases the resistance of the key bar 3 to the reel.
[0036] In some embodiments, under normal pressure, the top of the key bar 3 is flush with the side wall of the shaft tube 1 .
[0037] In some embodiments, a pressure plate 15 is fixedly connected to the shaft tube 1. Part of the pressure plate 15 is pressed onto the top of the key bar 3. A return spring 16 is provided between the key bar 3 and the pressure plate 15. When the piston 4 is reset, the key bar 3 is pulled back to be flush with the surface of the shaft tube 1 by the return spring 16.
[0038] The key strip 3 on the shaft tube 1 and the piston 4 are matched at a wedge angle. As the piston 4 moves axially, the key strip 3 extends radially, and the expansion force is amplified in this process.
[0039] The principle of amplification is:
[0040] Ginseng Figure 4, assuming that the axial force provided by the piston 4 to the key is P1, then the radial force k generated by the wedge surface is .
[0041] The piston 4 is displaced by the combined force of the elastic member 5 and the piston chamber 6, respectively, exerting opposing forces on both sides. Because the position of the piston 4 is directly related to the position of the expansion key, accurately determining the expansion key's status by measuring the position of the piston 4 is possible. Therefore, determining the position of the piston 4 by monitoring the measuring rod 8 fixedly connected to the piston 4 allows for more accurate and direct assessment of the inflatable shaft's status.
[0042] The induction ring 9 and the measuring rod 8 are fixed by the positioning pin 11. When the measuring rod 8 is subjected to the pulling force or pushing force of the piston 4 and produces axial displacement, the induction ring 9 moves synchronously. By detecting the position of the induction ring 9, the state of the inflatable shaft can be accurately judged.
[0043] The shaft tube 1 comprises a hollow sleeve 18 and a tail cap 17 mounted at the end of the sleeve 18. The aforementioned inlet bevel 12 is located on the sidewall of the tail cap 17. The sleeve 18 and tail cap 17 are securely connected by a locking screw. The end surface of the tail cap 17 has elastic locating holes adapted for the elastic member 5. The front end of the piston 4 has a front support plate 19, which also has elastic locating holes. The elastic member 5 abuts between the two elastic locating holes.
[0044] The piston 4 is fitted against the inner wall of the sleeve 18. As the sleeve 18 moves axially, the piston 4 has an inclined surface that is lower near the elastic member 5 and higher near the piston chamber 6. The end of the piston 4, away from the tail cap 17, is fixedly connected to a rear support plate 20 via fasteners. The rear support plate 20 is fixedly connected to the measuring rod 8 via a locking screw.
[0045] The shaft 2 is fixedly connected to the shaft tube 1. The rear support plate 20, the piston 4, the inner wall of the sleeve 18 and the end of the shaft 2 form the sealed cavity. The outer diameter of the end of the shaft 2 is adapted to the inner diameter of the measuring hole, and the two are sealed and connected by a seal.
[0046] The air passage 7 is offset from the detection hole 10 and extends to the tail of the shaft 2. The air passage 7 is connected to the sealed cavity from the end of the shaft 2.
[0047] The above-described embodiments are only preferred solutions of the present invention and do not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.
Claims
1. A mechanical inflatable shaft, characterized in that: It includes a shaft tube and a shaft rod. The shaft tube is connected to a number of key strips in a radial sliding manner. A piston that can slide along the axial direction of the shaft tube is provided in the shaft tube. The bottom wedge angles of the piston and the key strip are matched. In the axial direction, elastic parts and piston cavities are respectively provided on both sides of the shaft tube. The shaft rod is provided with an airway and a detection hole. The airway is connected to the piston cavity. The detection hole is arranged along the axial direction of the shaft rod. A measuring rod is provided in the detection hole. The measuring rod is fixedly connected to the piston. An induction ring is slidingly provided on the shaft rod. The induction ring is fixedly connected to the measuring rod. The position of the measuring rod is detected by the induction ring to judge the state of the inflatable shaft.
2. A mechanical inflatable shaft according to claim 1, characterized in that: An oblong hole is provided on the shaft rod, and the major axis of the oblong hole is arranged along the length direction. The induction ring is fixedly connected to the measuring rod through a positioning pin, and the positioning pin passes through the oblong hole. The shaft rod is provided with a positioning pin at the position of the detection hole corresponding to the stroke limit of the piston, and the position of the measuring rod is determined by the induction ring through the positioning pin.
3. A mechanical inflatable shaft according to claim 1, characterized in that: The piston is a hollow structure.
4. The mechanical inflatable shaft according to claim 1, characterized in that: The elastic members are arranged at equal intervals around the axis of the piston.
5. The mechanical inflatable shaft according to claim 1, characterized in that: An end of the shaft tube away from the shaft rod is provided with an introduction slope.
6. A mechanical inflatable shaft according to claim 5, characterized in that: The shaft tube is provided with a guide roller on the inclined surface corresponding to the introduction slope.
7. The mechanical inflatable shaft according to claim 1, characterized in that: The top of the key bar is provided with friction lines.
8. The mechanical inflatable shaft according to claim 7, characterized in that: Under normal pressure, the top of the key strip is flush with the side wall of the shaft tube.
9. The mechanical inflatable shaft according to claim 8, characterized in that: A number of guide rollers are provided between adjacent key strips.
10. The mechanical inflatable shaft according to claim 8, characterized in that: A pressing plate is fixedly connected to the shaft tube, a portion of the pressing plate is pressed onto the top of the key bar, and a return spring is provided between the key bar and the pressing plate.