Apparatus for air cylinder

Abstract

The present invention relates to an air cylinder device and comprises a cylinder unit consisting of a tubular cylinder body, a closed end plug that shields one end of the cylinder body, and an open end plug mounted on the other end of the cylinder body and having a rod passing hole along the axial direction, a piston capable of sliding movement along the axial direction within the cylinder body, a piston rod connected to the piston and capable of extending and sliding movement through the open end plug, and a packing cap detachably mounted on the open end plug to seal the gap between the rod passing hole of the open end plug and the piston rod.

Description

Technology Field

[0001] The present invention relates to an air cylinder device. Background Technology

[0003] An air cylinder is an actuator that performs linear reciprocating motion in an air pressure circuit. An air cylinder is equipped with a piston as an actuator inside the cylinder, and a piston rod is attached to the center of the piston, penetrating the upper central part of the cylinder and connecting to a driven body outside the cylinder. The piston and piston rod reciprocate in the axial direction of the cylinder when air is supplied to or discharged from the inside of the cylinder through an air port.

[0004] For such an air cylinder to operate normally, the air supplied to the interior of the cylinder must not leak. To this end, a packing made of urethane or NBR rubber is provided between the piston rod and the upper central part of the cylinder to prevent air from leaking from inside the cylinder.

[0005] However, conventional air cylinders have a structure that makes it impossible to replace the packing, so there is a problem in that equipment costs increase when the packing deteriorates and air leakage occurs, requiring the replacement of the air cylinder itself. The problem to be solved

[0007] Accordingly, the objective of the present invention is to provide an air cylinder device that can reduce equipment costs associated with air cylinder replacement by allowing the packing sealing the space between the piston rod and the piston rod passage to be easily replaced. means of solving the problem

[0009] The present invention comprises a cylinder unit comprising a tubular cylinder body, a closed end plug that shields one end of the cylinder body, and an open end plug mounted on the other end of the cylinder body and having a rod passing hole along the axial direction, a piston capable of sliding movement along the axial direction within the cylinder body, a piston rod connected to the piston and capable of extending and sliding movement through the open end plug, and a packing cap detachably mounted on the open end plug to seal the gap between the rod passing hole of the open end plug and the piston rod.

[0010] Here, it is preferable that the packing cap comprises a cap body detachably screw-coupled along the axial direction to the open end plug, an inward flange extending radially inward from the outer circumference of the cap body, and a packing that is received within the cap body so as to restrict axial movement by the inward flange and seals the space between the piston rod and the inward flange.

[0011] It is preferable to further include a pressure member formed to protrude along the axial direction at the end of the above-mentioned open plug and to press the packing.

[0012] It is preferable to further include a stopper formed on the open end plug and a stopper formed protrudingly in a portion of the inner circumference of the cap body to engage with the stopper, thereby restricting the axial movement of the cap body.

[0013] It is preferable to provide at least one spacing core between the above-mentioned stopper and the above-mentioned stopper. Effects of the invention

[0015] According to the present invention having the above-described configuration, the packing sealing the space between the piston rod and the piston rod passage can be easily replaced, thereby reducing the equipment cost associated with replacing the air cylinder. Brief explanation of the drawing

[0017] FIG. 1 is a cross-sectional view of an air cylinder device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of an air cylinder device according to another embodiment of the present invention. Specific details for implementing the invention

[0018] Hereinafter, an air cylinder device according to an embodiment of the present invention will be described in detail with reference to the attached drawings.

[0019] Referring to FIG. 1, an air cylinder device (100) according to an embodiment is composed of a cylinder unit (110), a piston (120), a piston rod (130), and a packing cap (140).

[0020] The cylinder unit (110) forms the basic framework and consists of a tubular cylinder body (112), a closed end plug (114) that shields one end of the cylinder body (112), and an open end plug (116) that is mounted on the other end of the cylinder body (112) and has a rod-through hole (117) along the axial direction.

[0021] A port (114a, 116a) for injecting and discharging compressed air is formed in each of the closed plug (114) and the open plug (116). Each port (114a, 116a) injects compressed air into the interior of the cylinder body (112) or discharges compressed air from the interior of the cylinder body (112).

[0022] A rod packing (118) is provided on the inner circumference of the rod passage hole (117) to seal the space between the piston rod (130) and the rod passage hole (117). A rod packing seating groove (117a) is formed on the inner circumference of the rod passage hole (117) so that the rod packing (118) can be seated thereon.

[0023] The piston (120) is provided to be slidable along the axial direction within the cylinder body (110). The piston (120) is slidably moved by compressed air introduced into the interior of the cylinder body (112) through ports (114a, 116a).

[0024] The piston rod (130) is connected to the piston (120) and moves in an extendable sliding motion through the open end plug (116).

[0025] The packing cap (140) is detachably mounted on the open end plug (116) and seals the gap between the rod through hole (117) of the open end plug (116) and the piston rod (130).

[0026] The packing cap (140) comprises a cap body (142) that is detachably screw-coupled along the axial direction to an open end plug (116), an inward flange (144) that extends radially inward from the outer circumference of the cap body (142), and a packing (146) that is received within the cap body (142) so as to restrict axial movement by the inward flange (144) and seals the space between the piston rod (130) and the inward flange (144).

[0027] The packing (146) is received in a receiving portion formed between a portion of the inner circumference of the cap body (142) and the inward flange (144). The packing (140) is seated on the inward flange (144) and consists of a body (147) having a packing hole (147a) formed in the center corresponding to a rod-through hole (117), a support portion (148) formed protruding axially from the outer circumference of the body (147) so as to contact the inner circumference of the cap body (142), and an elastic deformation portion (149) formed protruding axially so as to be positioned parallel to the support portion (148) in the center of the body (147).

[0028] Here, the elastic deformation portion (149) is formed to be coaxial with the packing hole (147a), and when the cap body (142) is coupled to the open end plug (116), it is pressed to be elastically deformed in the transverse direction relative to the axial direction by the inward flange (144) so ​​as to contact the outer circumference of the piston rod (130) and seal the space between the piston rod (130) and the inward flange (144).

[0029] In addition, it is preferable that a reinforcing core (150) be provided inside the body (147) and the support member (148) to improve the strength of the body (147) and the support member (148). Furthermore, the reinforcing core (150) supports the elastic deformation of the elastic deformation member (149) when the elastic deformation member (149) is elastically deformed by being pressed by the inward flange (144).

[0030] A rib (174a) is formed on each inner corner connecting the body (147) and the support member (148) and the body (147) and the elastic deformation member (149). The rib (174a) supports the support member (148) and the elastic deformation member (149) so that they do not undergo excessive elastic deformation when the support member (148) and the elastic deformation member (149) are pressed by the inward flange (144).

[0031] The rib (147a) supports the elastic deformation part (149) so that the elastic deformation part (149) is excessively elastically deformed, thereby increasing frictional resistance to the outer circumference of the piston rod (130) and hindering the smooth operation of the piston rod (130), or increasing wear of the elastic deformation part (149).

[0032] In addition, the support member (148) is excessively elastically deformed so that a gap does not occur between the body (147) and the inward flange (144).

[0033] FIG. 2 is a cross-sectional view of an air cylinder device according to another embodiment of the present invention.

[0034] The air cylinder device according to another embodiment of the present invention shown in FIG. 2 is substantially similar to the air cylinder device shown in FIG. 1, but differs in that the detailed configuration of the open end plug is different. Therefore, redundant descriptions will be omitted.

[0035] Referring to FIG. 2, a pressure portion (116b) is formed protruding along the axial direction at the end of the open end plug (116). When the packing cap (140) is coupled to the open end plug (116), the pressure portion (116b) presses the elastic deformation portion (149) of the packing (146) so that the elastic deformation portion (149) is elastically deformed in the transverse direction relative to the axial direction.

[0036] Additionally, a stopper (116c) is formed on the open end plug (116). A catcher (142a) that engages with the stopper (116c) is formed protrudingly on a portion of the inner circumference of the cap body (142). The catcher (142a) engages with the stopper (116c) when the cap body (142) is screw-coupled to the open end plug (116), thereby restricting the axial movement of the cap body (142).

[0037] Specifically, the cap body (142) is connected to the open end plug (116) only up to a preset position. That is, the packing (146), which is elastically deformed by being pressed by the pressurizing part (116b), is not excessively pressed so as not to hinder the extensional sliding movement of the piston rod (130).

[0038] And between the catch (142a) and the stop (116c), at least one gap-maintaining core (160) is detachably provided.

[0039] When the packing (146) deteriorates due to long-term use of the air cylinder device (100) and leakage occurs between the piston rod (130) and the inward flange (144), the operator removes the gap maintaining core (160) to increase the pressure of the packing (146) by the pressurizing part (116b), thereby maintaining airtightness between the piston rod (130) and the inward flange (144).

[0040] Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that various modifications and changes can be made to the present invention without departing from the technical spirit of the invention as described in the following claims. Explanation of the symbols

[0041] 110; Cylinder unit 112; Cylinder body 114; Closed plug 116; Open plug 117; Road passage hole 118; Load packing 120; piston 130; Piston rod 140; Packing cap 142; Cap body 144; Inward flange 146; Packing 150; reinforcing core material 160; spacing core

Claims

Claim 1 An air cylinder device comprising: a cylinder unit comprising a tubular cylinder body, a closed end plug shielding one end of the cylinder body, and an open end plug mounted on the other end of the cylinder body and having a rod passing hole along the axial direction; a piston capable of sliding along the axial direction within the cylinder body; a piston rod connected to the piston and capable of extending and sliding through the open end plug; and a packing cap detachably mounted on the open end plug to seal the gap between the rod passing hole of the open end plug and the piston rod. Claim 2 An air cylinder device according to claim 1, wherein the packing cap comprises: a cap body detachably screw-coupled along the axial direction to the open end plug; an inward flange formed extending radially inward from the outer circumference of the cap body; and a packing received within the cap body such that axial movement is restricted by the inward flange, thereby sealing the space between the piston rod and the inward flange. Claim 3 An air cylinder device according to claim 2, further comprising a pressurizing part formed to protrude along the axial direction at the end of the open end plug to pressurize the packing. Claim 4 An air cylinder device according to claim 2, further comprising a stopper formed on the open end plug and a stopper formed protrudingly in a portion of the inner circumference of the cap body to engage with the stopper and restrict axial movement of the cap body. Claim 5 An air cylinder device according to claim 4, characterized in that at least one spacing core is provided between the catch and the stop.

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