Small air cylinder
By setting an annular groove and an air inlet on the end cover of the small cylinder, increasing the chamber volume, and adopting a double-sealed piston structure, the problem of unstable movement of the small cylinder under high-frequency start-stop conditions is solved, and the stability and reliability are improved under miniaturization conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-03
- Publication Date
- 2026-03-31
AI Technical Summary
Small cylinders are susceptible to fluctuations in air pressure and frictional resistance under frequent start-stop conditions, leading to unstable motion and making it difficult to find a balance between miniaturization and motion stability.
An annular groove and an air inlet are provided on the end cover of the small cylinder to increase the chamber volume and a double-sealed piston structure is adopted. The parallelism of the end cover is less than 0.02mm by the spacer support, and the buffered air intake reduces the loss and improves the stability.
This achieves improved cylinder motion stability under miniaturization conditions, reduces losses, and enhances system reliability.
Smart Images
Figure CN224064611U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of small driving cylinder, especially a small cylinder. BACKGROUND
[0002] In the automatic production of packaging machinery, the micro cylinder is often used for the transmission box ejection device, and the piston rod is moved to remove unqualified products through the sensor triggering. However, under the high frequency start-stop working condition, the small cylinder (cylinder diameter ≤60mm, stroke ≤50mm) is easily affected by factors such as gas source pressure fluctuation and uneven friction resistance, resulting in unstable piston movement, trajectory deviation, speed fluctuation or crawling phenomenon. Although the guide mechanism or external buffer can be increased for compensation, it is difficult to meet the miniaturization while maintaining the movement stability due to space and cost constraints, which restricts the reliability of the system. SUMMARY
[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the utility model is to provide a small cylinder to achieve miniaturization while improving the movement stability.
[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is:
[0005] A small cylinder, comprising a piston mechanism driven by pressure gas, the piston mechanism is placed in the first end cover and the second end cover which are mirror images of each other and constitutes a closed first chamber and a second chamber on both sides of the mechanism, and an annular groove is formed on the first end cover and the second end cover to further increase the volume of the first chamber and the second chamber.
[0006] Further, the annular groove is opened along the axial direction away from the piston mechanism.
[0007] Further, the first end cover and the second end cover are supported by a plurality of spacer sleeves, the spacer sleeve has a first end face and a second end face respectively connected to the first end cover and the second end cover, and the parallelism of the first end face and the second end face is less than or equal to 0.02mm.
[0008] Further, the first end cover and the second end cover are provided with a first gas hole and a second gas hole for connecting the first chamber, the second chamber and the external pressure source, and the first gas hole and the second gas hole are connected to the annular groove on the first end cover and the second end cover respectively.
[0009] Further, the piston mechanism is a double-sealed piston structure.
[0010] Further, the outer diameter of the piston mechanism is 50.9mm.
[0011] The utility model discloses a beneficial effect lies in:
[0012] The utility model provides a small -size cylinder sets up annular groove cooperation side -open air inlet in cylinder chamber, passes through the means of increasing air chamber and air intake buffer realizes the purpose of reducing loss and promoting working stability. BRIEF DESCRIPTION OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will to the drawing needed to use in the embodiment or prior art description simple introduction.
[0014] Figure 1 It is the sectional view of the utility model Figure One .
[0015] Figure 2 It is the sectional view of the utility model Figure Two .
[0016] Figure 3 It is the explosion drawing of the utility model. DETAILED DESCRIPTION
[0017] In the description of the utility model, need explanation, the orientation or position relation that the terms "upper", "lower", "left", "right", "inner", "outer" etc. indicate is based on the orientation or position relation shown in the drawing, and the above description is simplified for the convenience of describing the utility model, and is not indicate or imply that the device or element indicated must have a particular orientation, with particular orientation configuration and operation, therefore can not be understood as the limitation of the utility model.
[0018] The singular form "a", "said" and "the" used in the specification contain plural forms unless it is clear that the singular form is indicated, the use of the word "include", "contain" and "have" in the specification indicates that the claimed feature exists, but does not exclude the existence of one or more other features. The word "and / or" used in the specification includes any and all combinations of one or more of the related listed items.
[0019] The exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that the present application can be presented in various different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments. In all the drawings, the same reference numerals represent the same or functionally similar elements.
[0020] Figure 1 And Figure 2The internal structure of the small cylinder is shown from two angles, including the piston mechanism 10 composed of the piston 11 and the piston rod 12, which is placed in the cylinder body 40 and is encapsulated by the first end cover 20 and the second end cover 30 to form the small cylinder. Preferably, an extension cap 11 is added on the top of the piston mechanism 10 for connection with the transmission mechanism, and the outer diameter of the piston 11 is 50.9 mm.
[0021] The first gas hole 21 is opened on the first end cover 20, which connects the first chamber 22 between the first end cover 20 and the piston 11 with the external compressed gas source; similarly, the second gas hole 31 is also opened on the second end cover 30, which connects the second chamber 32 between the second end cover 30 and the piston 11 with the external compressed gas source. In a preferred embodiment, the first end cover 20 and the second end cover 30 are mirror images and are opposite to each other. In another preferred embodiment, the first gas hole 21 and the second gas hole 31 are both opened on the side surface of the first end cover 20 and the second end cover 30, and the gas is bent to enter the first chamber 22 and / or the second chamber 32, which can form a buffer to slow down the start-up phenomenon.
[0022] Combined with reference Figure 3 The second annular groove 33 is opened in the second end cover 30, which is opened on the side away from the piston mechanism 10 in the axial direction, thereby increasing the volume of the second chamber 32 and avoiding the sudden filling of a large amount of gas into the small volume gas-filled chamber, which causes the movement of the piston 11 to further occur. Preferably, the connection position of the second gas hole 31 and the second chamber 32 is located at the second annular groove 33, so as to preferentially fill the gas into the annular structure. Similarly, the first annular groove 23 is also opened on the first end cover 20.
[0023] In order to further optimize the smoothness of the movement of the piston, the sealing structure on the outer periphery of the piston 11 adopts a double-layer sealing structure composed of the first sealing ring 13 and the second sealing ring 14. This double-layer sealing structure is also beneficial to control the leakage rate of the cylinder to be below 0.5%. A plurality of spacer sleeves 40 are arranged between the first end cover 20 and the second end cover 30, which are fixed supports between the first end cover 20 and the second end cover 30 and are connected with the first end cover 20 and the second end cover 30 through the first end surface 41 and the second end surface 42 on both sides. The parallelism of the first end surface 41 and the second end surface 42 must be less than or equal to 0.02 mm, so as to ensure the position degree between the first end cover 20 and the second end cover 30, prevent the deflection due to the position deviation of the two ends of the cylinder, and reduce the working loss of the mechanism. The outer periphery of the spacer sleeve 40 can also be provided with an oxidation coating to further prevent corrosion. Preferably, the number of the spacer sleeve 40 is 4 and is equally arranged on the outer periphery of the piston mechanism 10, and the length of the spacer sleeve 40 is 19.9 mm.
[0024] In the specification, when it is said that an element is "on", "fixed to", "connected to", "joined to" or the like another element, it can be directly on, fixed to, connected to, joined to or in contact with the other element, or an intervening element can be present.
[0025] It is to be understood that the terms "first", "second", and so on, can be used herein to describe various elements, but the elements should not be limited by these terms. The terms are only used to distinguish one element from another. Thus, a first element could be termed a second element without departing from the teachings of the present application.
Claims
1. A small cylinder comprising a piston mechanism driven by pressure gas, characterized by, The piston mechanism is arranged in the first end cover and the second end cover which are mirror images of each other and forms the first chamber and the second chamber on both sides of the mechanism, and annular grooves are formed on the first end cover and the second end cover to further increase the volumes of the first chamber and the second chamber.
2. A small cylinder as claimed in claim 1, characterized in that The annular grooves are formed along the axial direction and away from one side of the piston mechanism.
3. A small-bore cylinder as claimed in claim 2, characterised in that The first end cover and the second end cover are supported by a plurality of spacer sleeves, and the spacer sleeves have first end faces and second end faces which are respectively connected to the first end cover and the second end cover, and the parallelism of the first end faces and the second end faces is less than or equal to 0.02 mm.
4. A small-bore cylinder as claimed in claim 2, characterised in that The first end cover and the second end cover are provided with first gas holes and second gas holes for connecting the first chamber and the second chamber with an external pressure source, and the first gas holes and the second gas holes are respectively connected to the annular grooves on the first end cover and the second end cover.
5. A small-bore cylinder as claimed in claim 3 or 4, characterised in that, The piston mechanism is a double-seal piston structure.
6. A small-bore cylinder as claimed in claim 5, characterised in that The outer diameter of the piston mechanism is 50.9 mm.