Low-friction air cylinder

Abstract

The low-friction air cylinder comprises a cylinder barrel, a front cover and a rear cover, the front cover and the rear cover are arranged at the two ends of the cylinder barrel respectively, a piston and a piston rod are arranged in the cylinder barrel, and the piston is in clearance fit with the inner wall of the cylinder barrel. According to the utility model, a sealing ring arranged between the piston and the inner wall of the cylinder barrel is eliminated, so that the friction resistance in the cylinder is greatly reduced, and the energy consumption is obviously reduced; and meanwhile, the air cylinder can achieve quick response, the requirement for high-frequency reciprocating motion of the textile equipment is met, the tension and tension output by the air cylinder can be accurately controlled, the processing requirements for different fabrics in the textile technology are met, and the quality and production precision of textile products are effectively improved. Due to the ingenious design of the cylindrical surface guide section of the front cover, the concentricity of the front cover and the cylinder barrel is qualitatively improved, the piston can stably and smoothly move in the cylinder barrel, the phenomena of blockage and abrasion are effectively reduced, the overall service life of the air cylinder in textile equipment is greatly prolonged, and the maintenance cost of the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of air cylinder, especially relates to a low friction air cylinder. BACKGROUND

[0002] Air cylinder is an important mechanical element, which is used for converting the energy of compressed air into mechanical movement. It is widely used in industrial automation, mechanical manufacturing, metallurgy, textile, chemical industry and other fields for pushing, pulling, positioning and other tasks. It has simple structure, easy control and maintenance, and is an indispensable part of automation system.

[0003] Traditional air cylinder mostly adopts sealing ring to realize the sealing between the piston and the inner wall of the cylinder barrel. However, in some special working conditions, such as the operation of various textile equipment in the textile industry, such as looms, spinning machines, printing and dyeing equipment, the operation highly depends on the air cylinder to provide efficient and stable power output. In the weaving, stretching, printing and dyeing process of fabric, the air cylinder needs to accurately control the tension and tension, and ensure the quality of the fabric and the continuity of the production. However, the close contact between the sealing ring and the inner wall of the cylinder barrel will generate a large frictional resistance. Although the frictional resistance can be reduced by applying oil, the frictional resistance is still large, which not only consumes a lot of energy during the operation of the air cylinder, but also seriously affects the response speed and operation accuracy of the air cylinder, and it is difficult to meet the requirements of the textile equipment for efficient operation. In addition, the high frequency reciprocating motion characteristics of the textile equipment require high concentricity between the front cover and the cylinder barrel of the air cylinder. Poor concentricity will cause deviation of the piston movement, causing premature damage to the internal components of the air cylinder, and seriously affecting the normal operation and production efficiency of the textile equipment. With the continuous improvement of the requirements of the textile industry for production efficiency and product quality, it is urgent to develop a low friction air cylinder suitable for the textile industry, which can realize fast response and high concentricity. UTILITY MODEL CONTENTS

[0004] The utility model discloses a kind of low friction air cylinders to the defects and deficiencies of prior art, it cancels the sealing ring between piston and cylinder barrel inner wall, significantly reduce frictional resistance, realize fast response, so that it can meet the strict requirements of tension and tension in weaving process;It is by setting the cylindrical guide section in front cover, effectively improve the concentricity between front cover and cylinder barrel, to meet the efficient, stable operation needs of air cylinder.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model provides a low friction cylinder, including cylinder, front cover and rear cover respectively set up in both ends of cylinder, be provided with piston and piston rod in cylinder, the piston is matched with the clearance of cylinder inner wall, one end of piston rod is fixedly connected with piston, the other end of piston rod passes through front cover and extends in cylinder, front cover is provided with connecting portion, connecting portion includes the thread section and the column surface guide section who sets up in the front cover end portion in proper order from front to back, front cover is connected with cylinder through the thread section, the column surface guide section extends into cylinder, and the outer wall of column surface guide section is matched with cylinder inner wall.

[0007] Further, the rear end of the front cover is provided with a first annular groove for inserting the end of the cylinder.

[0008] Further, a first sealing ring is arranged between the front cover and the cylinder, and the front cover is provided with a second annular groove for mounting the first sealing ring.

[0009] Further, the piston divides the cylinder into a rod cavity and a rodless cavity, the front cover is provided with a first gas port communicating with the rod cavity, and the rear cover is provided with a second gas port communicating with the rodless cavity.

[0010] Further, the inside of the front cover is sequentially provided with a guide sleeve and a bushing from front to back, the piston rod sequentially passes through the bushing and the guide sleeve, the inner wall of the bushing is matched with the piston rod in clearance, and the bushing is provided with a vent hole for communicating the first gas port with the rod cavity.

[0011] Further, the rear end of the front cover is provided with a step portion limitedly matched with the bushing, and a second sealing ring is arranged between the bushing and the step portion.

[0012] Further, a third sealing ring is arranged between the bushing and the inner wall of the front cover.

[0013] Further, a fourth sealing ring is arranged between the piston and the piston rod.

[0014] Further, the outer side wall of the piston is provided with a third annular groove.

[0015] Further, the inner side wall of the guide sleeve is provided with a fourth annular groove.

[0016] After adopting the above structure, the utility model has the beneficial effects that:

[0017] (1) The utility model relates to a low friction air cylinder, including cylinder, the front cover and rear cover of setting respectively in the both ends of cylinder, be provided with piston and piston rod in the cylinder, the clearance fit between piston and cylinder inner wall, the utility model discloses cancel the traditional sealing ring sealing between the inner wall of piston and cylinder, guarantee the tiny gap between piston and cylinder inner wall through precision machining technology, when actual operation, the gas leakage is infinitesimal, and the thrust produced by air pressure is enough to push the piston to move steadily and rapidly in the cylinder. After canceling the sealing ring between the piston and the inner wall of the cylinder, the friction resistance in the cylinder is greatly reduced, and the energy consumption is significantly reduced. During the long-time continuous operation of the textile equipment, the energy-saving effect is particularly obvious. At the same time, the friction resistance in the cylinder is greatly reduced, so that the cylinder can realize rapid response, meet the demand of high-frequency reciprocating motion of the textile equipment, and be beneficial to accurately controlling the tension and tension of the cylinder output, meet the processing requirements of different fabrics in the textile process, effectively improve the quality and production precision of textile products. Furthermore, the sealing failure problem caused by aging and wear of the sealing ring is avoided, the reliability and stability of the cylinder working in the textile environment are improved, the downtime of the textile equipment caused by cylinder failure is reduced, and the production efficiency is improved. Finally, after canceling the sealing ring, the process of smearing grease is reduced, which is beneficial to improving the production efficiency of the cylinder and reducing the production cost of the cylinder.

[0018] (2) The utility model relates to a low friction air cylinder, the front cover realizes the screw joint with the cylinder through the connecting portion, the connecting portion includes the thread section and the column surface guide section that set up from front to back, the outer wall of the column surface guide section is adapted with the inner wall of the cylinder. The clever design of the column surface guide section of the front cover makes the concentricity of the front cover and the cylinder have a qualitative leap. Even under the complex vibration working condition of the textile equipment, the movement of the piston in the cylinder is still stable and smooth, which effectively reduces the jamming and wear phenomenon, greatly prolongs the overall service life of the cylinder in the textile equipment, and reduces the equipment maintenance cost. ACCURACY

[0019] In order to more clearly illustrate the specific embodiment of the utility model, the drawings needed in the following specific embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is the overall structure of the utility model sectional view;

[0021] Figure 2 It is the Figure 1 A structure enlarged schematic view of the utility model;

[0022] Figure 3 It is theFigure 1 a structure enlarged schematic view of B in the figure;

[0023] Figure 4 is a sectional view of the front cover of the utility model.

[0024] Figures 1 to 4 Reference numerals in the figure are:

[0025] 1, cylinder; 11, front cover; 111, connecting part; 1111, threaded section; 1112, cylindrical guide section; 112, first annular groove; 113, second annular groove; 114, first gas port; 115, step part; 12, rear cover; 121, second gas port; 13, piston; 131, third annular groove; 14, piston rod; 15, rod cavity; 16, rodless cavity; 17, guide sleeve; 171, fourth annular groove; 18, bushing; 181, vent hole; 2, first sealing ring; 3, second sealing ring; 4, third sealing ring; 5, fourth sealing ring. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purpose, features and advantages of the utility model more apparent, clear and understandable, the specific embodiments of the utility model will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0027] In the description of the utility model, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0028] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, if the term "multiple" appears, the meaning of the term "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0029] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, if there is a description such as "on" or "below" the first feature of the second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0031] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only embodiment.

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0033] As Figures 1 to 4As shown, a low-friction air cylinder includes a cylinder barrel 1, a front cover 11 and a rear cover 12 arranged at both ends of the cylinder barrel 1 respectively, a piston 13 and a piston rod 14 arranged in the cylinder barrel 1, the piston 13 is gap-fitted with the inner wall of the cylinder barrel 1, one end of the piston rod 14 is fixedly connected with the piston 13, the other end of the piston rod 14 penetrates through the front cover 11 and extends out of the cylinder barrel 1, the front cover 11 is provided with a connecting portion 111, the connecting portion 111 includes a threaded segment 1111 and a cylindrical guide segment 1112 arranged in the end of the front cover 11 in sequence from front to back, the front cover 11 is threadedly connected with the cylinder barrel 1 through the threaded segment 1111, the cylindrical guide segment 1112 extends into the cylinder barrel 1, and the outer wall of the cylindrical guide segment 1112 is adapted with the inner wall of the cylinder barrel 1.

[0034] Based on the above embodiment, the utility model wants to solve is provide a kind of low-friction air cylinder, including cylinder barrel 1, front cover 11 and rear cover 12 respectively arranged at both ends of the cylinder barrel 1, the cylinder barrel 1 is provided with piston 13 and piston rod 14, the piston 13 is gap-fitted with the inner wall of the cylinder barrel 1.The utility model cancels the traditional sealing ring sealing between the piston 13 and the inner wall of the cylinder barrel 1, and the small gap between the piston 13 and the inner wall of the cylinder barrel 1 is guaranteed by precision machining technology, when actually operating, gas leakage is extremely small, and the thrust generated by air pressure is sufficient to push the piston 13 to move smoothly and quickly in the cylinder barrel 1.After the sealing ring between the piston 13 and the inner wall of the cylinder barrel 1 is cancelled, the friction resistance in the air cylinder is greatly reduced, and energy consumption is significantly reduced, and the energy-saving effect is particularly obvious during the long-time continuous operation of the textile equipment;Meanwhile, the friction resistance in the air cylinder is greatly reduced, so that the air cylinder can realize rapid response, meet the demand of high-frequency reciprocating motion of textile equipment, and be beneficial to accurately control the tension and tension of air cylinder output, meet the processing requirements of different fabrics in textile process, effectively improve the quality and production precision of textile products;Furthermore, the sealing failure problem caused by aging and wear of sealing ring is avoided, the reliability and stability of the air cylinder working in the textile environment are improved, the downtime of textile equipment caused by air cylinder failure is reduced, and the production efficiency is improved;Finally, after the sealing ring is cancelled, the process of smearing grease is reduced, which is beneficial to improve the production efficiency of air cylinder and reduce the production cost of air cylinder.

[0035] In this embodiment, the precise machining is relied on to achieve the small gap fit between the piston 13 and the cylinder 1, thereby improving the requirement for the product concentricity, and the concentricity is mainly ensured by precise machining. In order to ensure the concentricity, the piston 13 and the inner wall of the cylinder 1 of the cylinder need to be precisely machined to ensure that their dimensional accuracy and shape accuracy meet the requirements. In a further preferred embodiment, the fit gap between the piston 13 and the inner wall of the cylinder 1 should be controlled within 0.01 mm. In theory, such a small gap cannot achieve absolute complete isolation of the rod cavity 15 and the rodless cavity 16, so that there is extremely weak gas exchange between the two cavities. However, the cylinder is mainly applied to the specific scene of textile equipment, and its working condition has unique characteristics. During the operation of the textile equipment, the load borne by the piston rod 14 is smaller compared with large industrial machinery, and the cylinder does not require pressure maintaining function. This makes the gas leakage amount extremely small even if there is a slight gap between the piston 13 and the cylinder 1 during actual operation, and the thrust generated by the gas pressure is sufficient to push the piston 13 to move smoothly and quickly in the cylinder 1. The rapid movement of the piston 13 directly drives the piston rod 14 to quickly respond to external instructions, and the friction loss caused by the slight gap is controlled at a low level during the entire movement process, thereby achieving the ideal effect of low friction. This low friction characteristic not only improves the operating efficiency of the cylinder, but also prolongs the service life of the equipment, providing a strong guarantee for the efficient and stable operation of the textile equipment. In a further preferred embodiment, the rear end of the cylinder is connected with a precision pressure regulating valve, and the front end of the cylinder is connected with an electric proportional valve. Through such configuration, stable pressure control of the rod cavity 15 and the rodless cavity 16 can be accurately realized. This precise differential pressure control greatly improves the efficiency and stability of the cylinder operation, meets the demand of the textile equipment for efficient and stable operation of the cylinder, and guarantees the continuity and accuracy of the textile operation.

[0036] In this embodiment, the front cover 11 is screwed with the cylinder 1 through the connecting part 111, which includes a threaded segment 1111 and a cylindrical guide segment 1112 arranged from front to back. The outer wall of the cylindrical guide segment 1112 is adapted to the inner wall of the cylinder 1. Figure 2 and Figure 4 As shown in the drawings, the ingenious design of the cylindrical guide segment 1112 of the front cover 11 makes a qualitative leap in the concentricity of the front cover 11 and the cylinder 1. Even under the complex vibration working condition of the textile equipment, the movement of the piston 13 in the cylinder 1 is still smooth and smooth, effectively reducing the jamming and wear phenomenon, greatly prolonging the overall service life of the cylinder in the textile equipment, and reducing the equipment maintenance cost.

[0037] As another preferred scheme of the utility model, the rear end of the front cover 11 is provided with a first annular groove 112 for inserting the end of the cylinder barrel 1. The first sealing ring 2 is arranged between the front cover 11 and the cylinder barrel 1, and the front cover 11 is provided with a second annular groove 113 for mounting the first sealing ring 2. In the embodiment, as shown in Figure 1 And Figure 2 The first annular groove 112 is arranged to facilitate the quick positioning of the front cover 11 and the cylinder barrel 1 during assembly, and the end of the front cover 11 is inserted into the first annular groove 112, which is conducive to improving the sealing of the rod cavity 15 and preventing foreign matter from entering the interior of the cylinder.

[0038] In the embodiment, the first sealing ring 2 is arranged to improve the sealing between the front cover 11 and the cylinder barrel 1, and can prevent external air, dust, moisture and other impurities from entering the interior of the cylinder, thereby ensuring the purity and quality of the compressed gas in the cylinder, preventing impurities from polluting the gas and affecting the compressibility and transmission performance, and avoiding wear and corrosion of the cylinder components. The second annular groove 113 is arranged to improve the reliability of the installation of the first sealing ring 2 and prevent the first sealing ring 2 from running out of position.

[0039] As another preferred scheme of the utility model, the piston 13 divides the cylinder barrel 1 into a rod cavity 15 and a rodless cavity 16, the front cover 11 is provided with a first gas port 114 communicating with the rod cavity 15, and the rear cover 12 is provided with a second gas port 121 communicating with the rodless cavity 16. The inside of the front cover 11 is sequentially provided with a guide sleeve 17 and a bushing 18 from front to back, the piston rod 14 sequentially passes through the bushing 18 and the guide sleeve 17, the inner wall of the bushing 18 is in clearance fit with the piston rod 14, and the bushing 18 is provided with a vent hole 181 for communicating the first gas port 114 with the rod cavity 15. The rear end of the front cover 11 is provided with a stepped portion 115 in limit fit with the bushing 18, and the second sealing ring 3 is arranged between the bushing 18 and the stepped portion 115. The third sealing ring 4 is arranged between the bushing 18 and the inner wall of the front cover 11. In the embodiment, as shown in Figure 1 And Figure 2 The arrangement of the guide sleeve 17 is conducive to improving the stability of the operation of the piston rod 14, and the arrangement of the bushing 18 is used for positioning and mounting the guide sleeve 17. The arrangement of the vent hole 181 is used for communicating the first gas port 114 with the rod cavity 15. The arrangement of the stepped portion 115 is used for limiting the bushing 18 and the guide sleeve 17, improving the tightness of the cooperation between the front cover 11, the guide sleeve 17 and the bushing 18, and reducing the vibration and noise during the operation of the cylinder. The arrangement of the second sealing ring 3 and the third sealing ring 4 is used for improving the sealing between the bushing 18 and the front cover 11, reducing the leakage of the gas, ensuring that the cylinder can generate sufficient thrust or pull, and ensuring the normal operation of the equipment.

[0040] As another preferred scheme of the utility model, the fourth sealing ring 5 is arranged between the piston 13 and the piston rod 14. In the embodiment, as shown in the figure, Figure 3 The fourth sealing ring 5 is used to improve the air tightness between the rod cavity 15 and the rodless cavity 16.

[0041] As another preferred scheme of the utility model, the outer side wall of the piston 13 is provided with a third annular groove 131. The inner side wall of the guide sleeve 17 is provided with a fourth annular groove 171. In the embodiment, as shown in the figures, Figure 1 And Figure 3 The third annular groove 131 and the fourth annular groove 171 are used to increase the heat dissipation area, which is beneficial to heat dissipation; meanwhile, the material is reduced, which is beneficial to cost saving.

[0042] Obviously, the above embodiment is only an example for clearly illustrating, and does not limit the implementation. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the implementation is not required and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model.

Claims

1. A low-friction cylinder, comprising a cylinder barrel (1), a front cover (11) and a rear cover (12) respectively disposed at both ends of the cylinder barrel (1), wherein a piston (13) and a piston rod (14) are disposed inside the cylinder barrel (1), the piston (13) is clearance-fitted with the inner wall of the cylinder barrel (1), one end of the piston rod (14) is fixedly connected to the piston (13), and the other end of the piston rod (14) passes through the front cover (11) and extends out of the cylinder barrel (1), characterized in that: The front cover (11) is provided with a connecting part (111), which includes a threaded section (1111) and a cylindrical guide section (1112) arranged sequentially from front to back at the end of the front cover (11). The front cover (11) is threadedly connected to the cylinder (1) through the threaded section (1111). The cylindrical guide section (1112) extends into the cylinder (1), and the outer wall of the cylindrical guide section (1112) is adapted to the inner wall of the cylinder (1).

2. A low-friction cylinder according to claim 1, characterized in that: The rear end of the front cover (11) is provided with a first annular groove (112) for the cylinder (1) end to be inserted.

3. A low-friction cylinder according to claim 1 or 2, characterized in that: A first sealing ring (2) is provided between the front cover (11) and the cylinder (1), and the front cover (11) is provided with a second annular groove (113) for installing the first sealing ring (2).

4. A low-friction cylinder according to claim 1, characterized in that: The piston (13) divides the cylinder (1) into a rod chamber (15) and a rodless chamber (16). The front cover (11) is provided with a first air port (114) communicating with the rod chamber (15), and the rear cover (12) is provided with a second air port (121) communicating with the rodless chamber (16).

5. A low-friction cylinder according to claim 4, characterized in that: Inside the front cover (11), a guide sleeve (17) and a bushing (18) are arranged sequentially from front to back. The piston rod (14) passes through the bushing (18) and the guide sleeve (17) in sequence. The inner wall of the bushing (18) is in clearance fit with the piston rod (14). The bushing (18) is provided with a vent hole (181) for connecting the first air port (114) and the rod chamber (15).

6. A low-friction cylinder according to claim 5, characterized in that: The rear end of the front cover (11) is provided with a stepped portion (115) that is matched with the bushing (18) for limiting, and a second sealing ring (3) is provided between the bushing (18) and the stepped portion (115).

7. A low-friction cylinder according to claim 5 or 6, characterized in that: A third sealing ring (4) is provided between the bushing (18) and the inner wall of the front cover (11).

8. A low-friction cylinder according to claim 1, characterized in that: A fourth sealing ring (5) is provided between the piston (13) and the piston rod (14).

9. A low-friction cylinder according to claim 1, characterized in that: The outer wall of the piston (13) is provided with a third annular groove (131).

10. A low-friction cylinder according to claim 5, characterized in that: The inner wall of the guide sleeve (17) is provided with a fourth annular groove (171).

Images