Center guiding type seat-free thin-wall air cylinder

Abstract

According to the technical scheme, the center guiding type seat-free thin-wall air cylinder is characterized in that the center guiding type seat-free thin-wall air cylinder comprises a cylinder sleeve, a rear end cover is fixed to one end of the cylinder sleeve in a sealed mode, a front end cover is fixed to the other end of the cylinder sleeve in a sealed mode, a piston is connected into the cylinder sleeve in a sliding mode, a push rod is fixed to the piston, and a guiding cavity is formed in the push rod; and a guide rod is fixed in the rear end cover and is connected in the guide cavity in a sliding manner. The center guiding type seat-free thin-wall air cylinder is mainly composed of a cylinder sleeve, a front end cover, a rear end cover and a piston, center guiding is achieved through a guiding cavity in a push rod and a guiding rod on the rear end cover on the basis of a pure cylindrical air cylinder, the phenomenon that a cylinder score is prone to occurring due to cylinder wall guiding is avoided, and due to the concave-convex type piston cylinder cover design, the service life of the cylinder is prolonged. The effective stroke is increased, the high-strength thin-wall cylinder sleeve reduces the installation space, the phenomena of blow-by, cylinder scoring and the like are eliminated on the whole, and the long service life and the high efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the field of cylinder devices, in particular to a center-guided seatless thin-wall cylinder. Background Technique

[0002] In current high-end manufacturing, on the premise of limited installation dimensions, it is a major problem to make full use of the limited space and add drive elements. One of the main reasons is that the volume and structure of existing cylinders and oil cylinders are restricted. In addition, for existing thin-wall cylinders, their internal guidance uses the inner wall of the cylinder as guidance, which sometimes causes scratches on the inner wall of the cylinder due to the guide ring itself, and ultimately causes the cylinder to "leak air" and shorten the service life of the cylinder. The present utility model is specifically designed to solve these problems. Usually, most low-cost cylinders mainly use aluminum alloy profiles as the cylinder liners. Due to material limitations, there are naturally two problems that cannot be ignored in the cylinders:

[0003] First, the strength of the aluminum alloy cylinder liner is significantly weaker than that of steel materials. Therefore, the cylinder wall cannot be made as thin as that of steel materials, resulting in the inability to achieve extremely small dimensions. Second, for various current popular cylinders, generally, the guidance of the cylinder push rod is realized by installing guide strips on the cylinder wall and the piston. After a long time, the guide strips will wear marks on the inner wall of the cylinder, causing air leakage between the front and rear chambers of the cylinder piston, and in severe cases, cylinder scoring, resulting in problems such as short service life. These two problems restrict the use performance of the equipment in some occasions. Content of the Utility Model

[0004] Aiming at the problems mentioned in the background technique, the purpose of the present utility model is to provide a center-guided seatless thin-wall cylinder to solve the problems mentioned in the background technique.

[0005] The above technical purpose of the present utility model is achieved through the following technical solutions:

[0006] A center-guided seatless thin-wall cylinder includes a cylinder liner. One end of the cylinder liner is hermetically fixed with a rear end cover, and the other end of the cylinder liner is hermetically fixed with a front end cover. A piston is slidably connected in the cylinder liner. A push rod is fixed on the piston. A guide cavity is opened in the push rod. A guide rod is fixed in the rear end cover, and the guide rod is slidably connected in the guide cavity.

[0007] By adopting the above technical solutions, the center-guided seatless thin-wall cylinder of the present invention is mainly composed of three major components: a cylinder liner, a front end cover, a rear end cover, and a piston. On the basis of a pure cylindrical cylinder, the present invention uses the guide cavity in the push rod and the guide rod on the rear end cover to achieve center guidance, avoiding the easy occurrence of cylinder scoring in wall guidance, the concave-convex piston cylinder head cooperation increases the effective stroke, and the high-strength thin-wall cylinder liner reduces the installation space. Generally, phenomena such as air leakage and cylinder scoring are eliminated, achieving long life and high efficiency.

[0008] Preferably, the guide rod is integrally formed on the rear end cover, and the guide rod is fixed at the center of the rear end cover.

[0009] By adopting the above technical solution, the structure is reliable and stable by using the integral forming method, and setting the guide rod at the center can improve the central guiding effect.

[0010] Preferably, the push rod is integrally formed with the piston, and the push rod is located at the center of the piston.

[0011] By adopting the above technical solution, setting the push rod and the piston to be integrally formed can improve the strength of the push rod, and setting the push rod at the center can improve the central guiding effect.

[0012] Preferably, the piston is provided with a plurality of first-type annular grooves on the ring wall close to the cylinder liner, and a first-type dynamic sealing ring is respectively arranged in each of the plurality of first-type annular grooves.

[0013] By adopting the above technical solution, the dynamic sealing effect of the piston can be improved by using the first annular groove and the first-type dynamic sealing ring therein.

[0014] Preferably, a cavity is provided in the guide rod, and a radial air return hole is provided on the guide rod.

[0015] By adopting the above technical solution, it is ensured that there is no air resistance when the guide rod moves in the guide cavity. The cavity and the air return hole on the guide rod realize the central guiding function. With central guiding, cylinder wall guiding is eliminated, so that phenomena such as cylinder scoring are fundamentally eliminated, and air leakage caused by cylinder scoring is also eliminated, thus prolonging the service life.

[0016] Preferably, the front end cover is stepped, the front end cover is fixed to the end of the cylinder liner by a plurality of bolts, and a plurality of second-type dynamic sealing rings are arranged between the front end cover and the push rod.

[0017] By adopting the above technical solution, the stepped front end cover can be firmly connected and fixed to the cylinder liner, and the second-type dynamic sealing ring can ensure good dynamic sealing effect between the push rod and the front end cover.

[0018] Preferably, the rear end cover is set to be stepped, the rear end cover is connected and fixed to the cylinder liner by a plurality of bolts, and a static sealing ring is fixed on the contact ring surface between the rear end cover and the cylinder liner.

[0019] By adopting the above technical solution, the reliability of the rear end cover fixation can be improved by using the static sealing ring between the rear end cover and the cylinder liner.

[0020] Preferably, a front mounting round hole is provided at the end of the push rod; a rear mounting round hole is provided at the outer tail of the rear end cover, which is directly used for application installation in cooperation with the front mounting round hole.

[0021] By adopting the above technical solution, the front mounting round hole and the rear mounting round hole can be conveniently and quickly installed.

[0022] In summary, the main beneficial effects of the present utility model are as follows:

[0023] This center-guided seatless thin-wall cylinder mainly consists of three major components: a cylinder liner, a front end cover, a rear end cover, and a piston. On the basis of a pure cylindrical cylinder, the present utility model utilizes the guiding cavity in the push rod and the guiding rod on the rear end cover to achieve center guidance, avoiding the phenomenon of cylinder wall guiding being prone to cylinder scoring. The concave-convex piston cylinder head cooperation increases the effective stroke, and the high-strength thin-wall cylinder liner reduces the installation space. Generally, phenomena such as air leakage and cylinder scoring are eliminated, achieving long life and high efficiency. As is well known, under the premise of the same thrust, reducing the cylinder volume and maximizing the cylinder swing and telescoping are major problems. Especially for robotic arms, robot telescopic arms, laser pipe cutting machine chucks, etc., reducing the cylinder outer diameter and increasing the cylinder telescopic ratio are of great significance. The conceived thin walls change the previous design concept from the structure, realizing the advantages of small volume, large driving force, and completely eliminating the cylinder scoring phenomenon. Description of the Drawings

[0024] Figure 1 is a structural cross-sectional view of the present utility model.

[0025] Reference numerals: 1. Cylinder liner; 2. Rear end cover; 3. Front end cover; 4. Piston; 5. Push rod; 6. Guiding cavity; 7. Guiding rod; 8. First type of annular groove; 9. First type of dynamic sealing ring; 10. Cavity; 11. Air return channel hole; 12. Second type of dynamic sealing ring; 13. Static sealing ring; 14. Front mounting round hole. Detailed Embodiments

[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] Embodiment

[0028] Reference Figure 1, A center-guided seatless thin-wall cylinder, a center-guided seatless thin-wall cylinder, including a cylinder liner 1, one end of the cylinder liner 1 is sealed and fixed with a rear end cover 2, the other end of the cylinder liner 1 is sealed and fixed with a front end cover 3, a piston 4 is slidably connected in the cylinder liner 1, a push rod 5 is fixed on the piston 4, a guide cavity 6 is provided in the push rod 5, and a guide rod 7 is fixed in the rear end cover 2, and the guide rod 7 is slidably connected in the guide cavity 6. This center-guided seatless thin-wall cylinder is mainly composed of three major components: the cylinder liner 1, the front end cover 3, and the rear end cover 2. Based on a pure cylindrical cylinder, the utility model utilizes the guide cavity 6 in the push rod 5 and the guide rod 7 on the rear end cover 2 to achieve center guidance, avoiding the phenomenon of cylinder wall guiding being prone to cylinder scoring, the concave-convex piston 4 and cylinder head matching, and the high-strength thin-wall cylinder liner 1, eliminating phenomena such as air leakage and cylinder scoring, and achieving long life and high efficiency.

[0029] Reference Figure 1 , wherein the guide rod 7 is integrally formed on the rear end cover 2, and the guide rod 7 is fixed at the center of the rear end cover 2. The structure is reliable and stable by using the integral forming method. Setting the guide rod 7 at the center can improve the center guiding effect. The push rod 5 and the piston 4 are integrally formed, and the push rod 5 is located at the center of the piston 4. Integrally forming the push rod 5 and the piston 4 can improve the strength of the push rod 5, and setting the push rod 5 at the center can improve the center guiding effect.

[0030] Reference Figure 1 , wherein the piston 4 is provided with a plurality of first-type annular grooves 8 on the annular wall close to the cylinder liner 1, and a plurality of first-type dynamic sealing rings 9 are respectively arranged in the plurality of first-type annular grooves 8. The first-type annular grooves 8 and the first-type dynamic sealing rings 9 therein can improve the dynamic sealing effect of the piston 4. A cavity 10 is provided in the guide rod 7, and a radial air return hole 11 is provided on the guide rod 7 to ensure that there is no air resistance when the guide rod moves in the guide cavity. The cavity 10 and the air return hole 11 on the guide rod 7 achieve the center guiding function. With center guiding, cylinder wall guiding is eliminated, thus fundamentally eliminating phenomena such as cylinder scoring and also eliminating the air leakage caused by cylinder scoring, extending the service life.

[0031] Reference Figure 1 , wherein the front end cover 3 is stepped, the front end cover 3 is fixed to the end of the cylinder liner 1 by a plurality of bolts, and a plurality of second-type dynamic sealing rings 12 are provided between the front end cover 3 and the push rod 5. The stepped front end cover 3 can be firmly connected and fixed to the cylinder liner 1, and the second-type dynamic sealing rings 12 can ensure good dynamic sealing effect between the push rod 5 and the front end cover 3. The first-type dynamic sealing rings 9 and the second-type dynamic sealing rings 12 are both dynamic sealing rings, such as O-rings.

[0032] Reference Figure 1, wherein the rear end cover 2 is arranged in a stepped shape, and the rear end cover 2 is fixedly connected to the cylinder liner 1 by a plurality of bolts. A static sealing ring 13 is fixed on the contact annular surface between the rear end cover 2 and the cylinder liner 1, and the static sealing ring 13 between the rear end cover 2 and the cylinder liner 1 can improve the reliability of the fixation of the rear end cover 2. A front mounting round hole 14 is provided at the end of the push rod 5; a rear mounting round hole 15 is provided at the outer tail of the rear end cover 2, which is directly used for application installation in cooperation with the front mounting round hole 14. The front mounting round hole 14 and the rear mounting round hole 15 facilitate quick installation.

[0033] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A center-guided seatless thin-walled cylinder, comprising a cylinder sleeve (1), characterized in that: A rear end cover (2) is sealed and fixed to one end of the cylinder sleeve (1), a front end cover (3) is sealed and fixed to the other end of the cylinder sleeve (1), a piston (4) is slidably connected inside the cylinder sleeve (1), a push rod (5) is fixed on the piston (4), a guide cavity (6) is provided in the push rod (5), a guide rod (7) is fixed in the rear end cover (2), and the guide rod (7) is slidably connected in the guide cavity (6).

2. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: The guide rod (7) is integrally formed on the rear end cover (2), and the guide rod (7) is fixed at the center of the rear end cover (2).

3. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: The push rod (5) and the piston (4) are integrally formed, and the push rod (5) is located at the center of the piston (4).

4. A center-guided seatless thin-walled cylinder according to claim 3, characterized in that: The piston (4) is provided with a plurality of first-type annular grooves (8) on the annular wall close to the cylinder sleeve (1), and a first-type dynamic sealing ring (9) is respectively arranged in each of the plurality of first-type annular grooves (8).

5. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: A cavity (10) is provided in the guide rod (7), and a radial air return hole (11) is provided on the guide rod (7).

6. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: The front end cover (3) is stepped and fixed to the end of the cylinder sleeve (1) by a plurality of bolts. A plurality of second-type dynamic sealing rings (12) are arranged between the front end cover (3) and the push rod (5).

7. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: The rear end cover (2) is arranged in a stepped shape, the rear end cover (2) is connected and fixed to the cylinder sleeve (1) via a plurality of bolts, and a static sealing ring (13) is fixed to the contact annular surface between the rear end cover (2) and the cylinder sleeve (1).

8. A center-guided seatless thin-walled cylinder according to claim 1, characterized in that: The end of the push rod (5) is provided with a front mounting circular hole (14); the outer tail of the rear end cover (2) is provided with a rear mounting circular hole (15) which cooperates with the front mounting circular hole (14) for direct application installation.

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