Composite air cylinder for pneumatic chuck

Abstract

The composite air cylinder comprises a first cylinder body, a second cylinder body and a piston rod, a first sealing cavity for containing the second cylinder body is formed in the first cylinder body, an inflation inlet is formed in one side of the first cylinder body, and the interior of the first cylinder body is connected with the second cylinder body in a sliding and sealing mode. A second sealing cavity for containing the piston rod is formed in the second cylinder body, the piston rod is in sliding sealing connection with the second cylinder body, an annular groove is formed in the inner wall of the end, close to the first inflation inlet, of the second cylinder body, an elastic check ring is arranged in the annular groove, and the overall weight of the composite air cylinder is reduced through the elastic check ring; the mounting and dismounting efficiency is improved, the internal structure of the composite air cylinder is simplified, and the use performance of the composite air cylinder is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cylinders, in particular to a composite cylinder for a pneumatic chuck. Background Technique

[0002] In the field of machining technology, laser cutting technology, as a technology with strong production capacity, has the following advantages: high cutting precision, high dimensional accuracy, smooth cut without burrs, and small loss; small heat influence in the laser cutting area, no thermal deformation, and good consistency in part processing; in order to make the control of machining precision more stable during the cutting process, a pneumatic chuck will be applied. As a common machining equipment, the pneumatic chuck is used as a clamping mechanism in a laser pipe cutting machine to clamp and fix a workpiece for further processing such as cutting and drilling of the workpiece.

[0003] Due to the numerous types of pipes, the clamping stroke of the pneumatic chuck needs to be large enough to meet the requirements. And the clamping of the chuck is powered by a cylinder. Therefore, a pneumatic chuck with a large stroke first requires a cylinder with a large stroke to cooperate with it. However, a cylinder with a large stroke is not suitable for installation in a pneumatic chuck with a limited installation space. The existing composite cylinders can be small and short in volume and have a long stroke. After retrieval, it is found that the Chinese utility model patent with the patent application number 202222386987.8 discloses a composite cylinder for a pneumatic chuck of a laser pipe cutting machine, which includes a first cylinder body, a second cylinder body and a piston rod. The first cylinder body is provided with a first sealing cavity for accommodating the second cylinder body. The second cylinder body can slide in the first sealing cavity. The second cylinder body is provided with a second sealing cavity for accommodating the piston rod. The piston rod can slide in the second sealing cavity. Compared with the traditional technology, this application adopts the principle of double-cylinder superposition, increasing the stroke of the cylinder by double, and at the same time having only the length of one cylinder itself, meeting the requirements of the pneumatic chuck on the current laser pipe cutting machine.

[0004] However, in the actual use process by the inventor of the above-mentioned composite cylinder, it is found that for the second cylinder body, as the cylinder body to be extended, the lighter its overall mass is, the better. However, in the above-mentioned application, a plug is arranged on one side of the second cylinder body close to the first air inlet. The design of this plug increases the weight of the second cylinder body, and the installation and disassembly process is complicated, which urgently needs to be optimized and improved. Content of the Utility Model

[0005] The purpose of the utility model is to provide a composite cylinder for a pneumatic chuck to solve the problem that the plug design in the above background technique increases the mass of the cylinder body to be extended.

[0006] To achieve the above object, the utility model provides the following technical solution: a composite cylinder for a pneumatic chuck, comprising a first cylinder body, a second cylinder body and a piston rod. A first sealing cavity for accommodating the second cylinder body is formed inside the first cylinder body. An air inlet is formed on one side of the first cylinder body. The inside of the first cylinder body is slidably and sealingly connected to the second cylinder body. A second sealing cavity for accommodating the piston rod is formed inside the second cylinder body. The piston rod is slidably and sealingly connected to the second cylinder body. An annular groove is formed on the inner wall of the second cylinder body near one end of the first air inlet, and a snap ring is arranged inside the annular groove.

[0007] Preferably, a first sealing groove is formed on the outer wall of the second cylinder body near one end of the air inlet, and a sealing ring is arranged inside the first sealing groove.

[0008] Preferably, a second sealing groove is formed on the side wall of one end of the piston rod near the air inlet, and a sealing ring is arranged inside the second sealing groove.

[0009] Preferably, the snap ring is an axial snap ring, and the material of the snap ring is 65 manganese steel.

[0010] Preferably, the inner diameter of the snap ring 8 is smaller than the inner diameter of the second cylinder body 2.

[0011] The beneficial effects of the utility model are as follows:

[0012] (1) By arranging a snap ring for limiting the piston rod, without affecting the internal ventilation, the overall weight of the composite cylinder is reduced, the installation and disassembly efficiency is improved, the internal structure of the composite cylinder is simplified, and the performance of the composite cylinder is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic internal planar structure diagram of the utility model.

[0014] In the figure: 1, first cylinder body; 2, second cylinder body; 3, piston rod; 4, first sealing cavity; 5, air inlet; 6, second sealing cavity; 7, annular groove; 8, snap ring; 9, first sealing groove; 10, second sealing groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the protection scope of the present utility model.

[0016] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0017] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0018] Please refer to Figure 1 , an embodiment provided by the present utility model: a composite cylinder for a pneumatic chuck, including a first cylinder body 1, a second cylinder body 2 and a piston rod 3. A first sealing cavity 4 for accommodating the second cylinder body 2 is provided inside the first cylinder body 1. An air inlet 5 is provided on one side of the first cylinder body 1. The inside of the first cylinder body 1 is slidably and sealingly connected to the second cylinder body 2. A second sealing cavity 6 for accommodating the piston rod 3 is provided inside the second cylinder body 2. A second sealing groove 10 is provided on the side wall of one end of the piston rod 3 close to the air inlet 5. A sealing ring is provided inside the second sealing groove 10. The piston rod 3 is slidably and sealingly connected to the second cylinder body 2. A first sealing groove 9 is provided on the outer wall of one end of the second cylinder body 2 close to the air inlet 5. A sealing ring is provided inside the first sealing groove 9.

[0019] Air enters through the air inlet 5. The gas first enters the rodless cavity of the first cylinder block, and then enters the rodless cavity of the second cylinder block 2, pushing the piston rod 3 to move. After moving through the entire stroke of the piston rod 3, the piston rod 3 drives the second cylinder block 2 to move and continue to extend, so as to adapt to pipes with a smaller diameter.

[0020] A ring groove 7 is formed on the inner wall of the second cylinder block 2 near the air inlet 5. An elastic retaining ring 8 is arranged inside the ring groove 7. The elastic retaining ring uses a shaft retaining ring, and the material of the elastic retaining ring is 65 manganese steel. The inner diameter of the elastic retaining ring 8 is smaller than the inner diameter of the second cylinder block 2, aiming to block and limit the piston rod 3; when the piston rod 3 completes the clamping task and retracts, the end of the piston rod 3 touches the elastic retaining ring 8, and the piston rod 3 then drives the second cylinder block 2 to retract. Compared with using a plug cover, the structure is simpler, the mass of the entire composite cylinder decreases, and the installation and disassembly are more convenient. Only need to clamp the lug of the elastic retaining ring with a special pliers and move it in the direction of the notch of the elastic retaining ring to make the diameter of the elastic retaining ring smaller. After placing it in the ring groove 7, release the special pliers, and the elastic retaining ring expands outwards and is clamped inside the ring groove 7.

[0021] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite cylinder for a pneumatic chuck, comprising a first cylinder body (1), a second cylinder body (2) and a piston rod (3). A first sealing cavity (4) for accommodating the second cylinder body (2) is formed inside the first cylinder body (1). An air inlet (5) is formed on one side of the first cylinder body (1). The inside of the first cylinder body (1) is slidably and sealingly connected to the second cylinder body (2). A second sealing cavity (6) for accommodating the piston rod (3) is formed inside the second cylinder body (2). The piston rod (3) is slidably and sealingly connected to the second cylinder body (2), characterized in that: An annular groove (7) is formed on the inner wall of one end of the second cylinder block (2) close to the air inlet (5), and a snap ring (8) is arranged inside the annular groove (7).

2. The composite cylinder for a pneumatic chuck according to claim 1, wherein: A first sealing groove (9) is formed on the outer wall of one end of the second cylinder block (2) close to the air inlet (5), and a sealing ring is arranged inside the first sealing groove (9).

3. The composite cylinder for a pneumatic chuck according to claim 1, characterized in that: A second sealing groove (10) is formed on the side wall of one end of the piston rod (3) close to the air inlet (5), and a sealing ring is arranged inside the second sealing groove (10).

4. The composite cylinder for a pneumatic chuck according to claim 1, wherein: The snap ring is an axial retaining ring, and the material of the snap ring is 65 manganese steel.

5. The composite cylinder for a pneumatic chuck according to claim 4, characterized in that: The inner diameter of the snap ring (8) is smaller than the inner diameter of the second cylinder block (2).

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